7 Hidden Islands in Thailand Tourists Don't Know About

Myth vs. Reality: The Truth About Thailand's Overcrowded Islands

Many travelers believe that Thailand's pristine, untouched island paradise is a relic of the past. Popular media often depicts the country's southern provinces as overrun by mass tourism, party boats, and concrete resorts. While this is increasingly true for hotspots like Phuket, Koh Phi Phi, and Koh Samui, it is a myth that the entire country has lost its secluded charm. According to the Tourism Authority of Thailand (TAT), Thailand's coastline and territories encompass over 1,400 islands and islets. A vast majority of these remain undeveloped, protected by national marine park status, or simply bypassed by commercial ferry routes.

The reality is that pristine, crowd-free islands still exist for travelers willing to venture beyond standard booking platforms and step off the well-trodden tourist trail. These hidden gems offer a glimpse of Thailand as it was thirty years ago: electricity powered by solar panels or evening generators, empty beaches lined with casuarina trees instead of lounge chairs, and local communities practicing traditional ways of life. However, visiting these locations requires careful planning, flexible timelines, and a willingness to forego certain modern luxuries like 24-hour air conditioning, high-speed fiber-optic internet, and easily accessible ATMs.

The 7 Hidden Thai Islands to Visit Now

1. Koh Phra Thong (Phang Nga)

Located in the Andaman Sea just off the coast of Phang Nga province, Koh Phra Thong (Golden Buddha Island) is one of Thailand's most ecologically unique islands. Unlike the dramatic limestone karsts that define nearby Phang Nga Bay, Koh Phra Thong is remarkably flat, featuring an interior landscape that resembles an African savannah. This flat topography is characterized by golden-grass fields, paperbark (melaleuca) forests, and freshwater swamps.

The island is a haven for biodiversity. According to the IUCN Red List, Koh Phra Thong is one of the last remaining nesting sites in Thailand for the vulnerable Lesser Adjutant Stork (Leptoptilos javanicus). It is also home to green sea turtles that lay eggs along the deserted 15-kilometer western beach from November to February.

• How to get there: Fly into Phuket International Airport, take a taxi north to Khura Buri Pier (approximately 2.5 hours), and hire a local longtail boat for a 1-hour crossing to the island. Check transit options via the Ministry of Transport portal for seasonal updates.
• Approximate costs: Longtail boat charter from Khura Buri: 1,500 to 2,000 THB ($42 - $56 USD) per boat. Mid-range eco-lodge accommodation: 1,800 to 3,500 THB ($50 - $98 USD) per night.
• Local Tip: There are no ATMs or convenience stores on the island. Bring sufficient cash in Thai Baht to cover all meals, boat excursions, and national park entry fees.

2. Koh Tarutao (Satun)

Koh Tarutao is the largest island within the Tarutao National Marine Park, located in the far southwest of Thailand, near the Malaysian border. Managed strictly by the Department of National Parks, Wildlife and Plant Conservation (DNP), the island is devoid of commercial resorts, private vehicles, and noisy nightlife. Instead, visitors find dense, virgin rainforests, rugged limestone cliffs, and historical ruins from its dark past as a concentration camp and pirate stronghold.

During the late 1930s and 1940s, Koh Tarutao held over 3,000 Thai political prisoners and high-profile convicts. When World War II disrupted supply chains from the mainland, both prisoners and guards faced starvation, leading them to band together to raid passing merchant vessels in the Strait of Malacca, becoming some of the most feared pirates in Southeast Asia.

• How to get there: Fly to Hat Yai International Airport, take a shared minivan to Pak Bara Pier in Satun, and board a national park ferry or speed boat bound for Koh Lipe, which stops at Koh Tarutao on request. Ensure you review the Thailand visa guide before entering remote southern borders near Malaysia.
• Approximate costs: National Park entry fee: 200 THB ($5.60 USD) for foreigners. DNP-run basic bungalows: 800 to 1,500 THB ($22 - $42 USD) per night; tent rentals: 300 THB ($8.40 USD) per night.
• Historical Site: Visit Ao Talo Wao on the eastern side of the island to explore the historic prison site, complete with replica barracks, an informative exhibition hall, and a walking trail through the jungle ruins.

3. Koh Jum / Koh Pu (Krabi)

While millions of tourists flock to Ao Nang and Railay Beach annually, the island of Koh Jum (whose northern, mountainous half is called Koh Pu) remains remarkably peaceful. Situated just 25 kilometers south of Krabi town, Koh Jum offers a slow-paced lifestyle dominated by traditional fishing villages, rubber plantations, and uncrowded, golden-sand beaches that look out toward the Phi Phi archipelago.

The island is split between three main villages: Ban Koh Jum in the south, Ban Ting Rai in the center, and Ban Koh Pu in the north. The local population is a friendly mix of Thai-Muslims, Thai-Buddhists, and Urak Lawoi (Sea Gypsies), living harmoniously and practicing sustainable, small-scale fishing.

• How to get there: From Krabi Pier (Klong Jilad or Laem Kruat), take a local longtail boat or passenger ferry. Many travelers combine this with a broader Krabi itinerary to balance busy sightseeing with remote relaxation.
• Approximate costs: Longtail boat from Laem Kruat Pier: 100 THB ($2.80 USD) per person. Beachfront bamboo bungalows: 600 to 1,200 THB ($17 - $34 USD) per night.
• Local Tip: Rent a scooter to explore the island, but drive slowly. The roads are narrow, and it is common to encounter monitor lizards, monkeys, and domestic goats crossing the paths.

4. Koh Bulon Lae (Satun)

For those seeking the postcard-perfect white sands and turquoise waters of Koh Lipe without the high-density development, Koh Bulon Lae is the ultimate alternative. Located roughly 20 kilometers offshore from Satun province, this tiny island can be walked from end to end in less than 40 minutes.

The island is surrounded by healthy coral reefs, making it an exceptional spot for snorkeling directly from the shore. Schooling fusiliers, anemonefish, and occasional blacktip reef sharks can be spotted in the clear waters of School Beach and Mango Bay. There are no cars or motorbikes on the island; transportation is strictly on foot along sandy footpaths shaded by towering pine trees.

• How to get there: High-speed speedboats operating between Pak Bara Pier and Koh Lipe stop at Koh Bulon Lae during the high season (November to April). During the low season, boat services are highly restricted due to monsoon waves.
• Approximate costs: Speedboat ticket from Pak Bara: 500 to 600 THB ($14 - $17 USD) one way. Eco-resort bungalows: 1,500 to 3,000 THB ($42 - $84 USD) per night.
• Environmental Notice: Waste management is a critical issue on tiny islands. Visitors are urged to pack out all non-biodegradable trash, particularly plastic bottles and batteries, back to the mainland.

5. Koh Yao Yai (Phang Nga)

Positioned directly between Phuket and Krabi in the middle of Phang Nga Bay, Koh Yao Yai (Big Long Island) is surprisingly undeveloped despite its highly accessible location. While its sister island, Koh Yao Noi, has developed a reputation for boutique luxury resorts, Koh Yao Yai remains agricultural and community-focused.

The island's economy is rooted in coconut farming, rubber tapping, and traditional fishing. The local communities are predominantly Muslim, meaning visitors should dress modestly when traveling through villages and respect local customs regarding alcohol consumption, which is generally restricted to private resorts and select restaurants.

• How to get there: Regular speedboats depart from Phuket's Bang Rong Pier or Krabi's Tha Len Pier. Check regional transit guides like Phang Nga transport for schedules.
• Approximate costs: Speedboat from Phuket: 300 to 400 THB ($8.40 - $11.20 USD) per person. Local homestays and mid-range resorts: 1,000 to 2,500 THB ($28 - $70 USD) per night.
• Must-See: Laem Had Beach, a stunning white sand spit that curves out into the ocean, creating a spectacular sandbar effect during low tide. It was featured briefly in the film Mechanic: Resurrection.

6. Koh Lao Liang (Trang)

Part of the Mu Ko Petra National Park in Trang Province, Koh Lao Liang is actually a pair of twin islands (Lao Liang Nong and Lao Liang To) characterized by towering, vertical limestone cliffs that rise dramatically out of the Andaman Sea. This unique geology makes it a world-class destination for rock climbing, though it remains far less crowded than Tonsai or Railay in Krabi.

To preserve the delicate marine environment, the national park limits overnight visitors to a single, eco-friendly tented camp on the beach of Lao Liang Nong. There are no permanent concrete structures, roads, or commercial shops on the island.

• How to get there: Travel to Trang city, take a minivan to Hat Yao Pier, and board a pre-arranged longtail boat or national park vessel. Avoid common Trang tourist traps by booking transfers directly through official park representatives or authorized eco-tour operators.
• Approximate costs: All-inclusive overnight packages (including tented accommodation, three meals, and boat transfers): 1,800 to 2,500 THB ($50 - $70 USD) per person per night.
• Activity Highlight: Sea kayaking around the base of the limestone cliffs is exceptional, offering access to hidden sea caves and small, private pocket beaches accessible only by water.

7. Koh Phayam (Ranong)

Often described as "Ko Samui thirty years ago," Koh Phayam is the second largest island in the Andaman Sea off the coast of Ranong province. Known for its cashew orchards, bohemian vibe, and long, sweeping bays, the island has resisted large-scale resort development and retains a dedicated community of local residents and long-stay travelers.

The main beaches, Aow Yai (Big Bay) and Aow Khao Kwai (Buffalo Horn Bay), offer excellent beach breaks for surfing during the tail end of the southwest monsoon (October to November). The island is completely car-free, with locals and visitors getting around on a network of narrow concrete paths using motorbikes or bicycles.

• How to get there: Fly or take an overnight bus from Bangkok to Ranong town, then take a speedboat or slow boat from the Ranong Pier. Plan your route using our comprehensive Ranong itinerary.
• Approximate costs: Speedboat from Ranong: 350 THB ($10 USD) one way (takes 45 minutes). Motorbike rental: 150 to 250 THB ($4.20 - $7 USD) per day.
• Local Insight: The island's signature crop is the Phayam cashew nut, which is roasted traditionally over open fires. Visit local processing shacks to buy fresh, warm cashews directly from the farmers.

History vs. Legend: The Tales of Koh Tarutao

When exploring islands with rich histories like Koh Tarutao, it is vital to distinguish historical facts documented by government archives from the local folklore told by fishermen around evening campfires. Below is a comparison of documented history versus local legends surrounding the island.

Disclaimer: While exploring historical ruins and caves on Koh Tarutao, visitors are urged to show respect. Do not touch or remove historical artifacts, and avoid entering national park caves or temples after dark out of respect for local spiritual beliefs and safety concerns regarding nocturnal wildlife.

Head-to-Head Comparison: Eco-Wilderness vs. Slow Bohemian Life

To help you decide which style of hidden island suits your travel preferences, we have compared Koh Phra Thong (representing the ultimate wild, off-the-grid eco-experience) with Koh Phayam (representing the laid-back, artistic slow-travel community).

Essential Logistics & Infrastructure Guide

Traveling to off-the-grid destinations requires careful preparation. Below is a structured summary of the essential travel logistics you must consider before embarking on your journey to Thailand's hidden islands.

Pros & Cons of Off-the-Grid Island Travel

Pros:

• Unrivaled natural beauty, empty beaches, and pristine marine ecosystems.
• Authentic cultural interactions with local communities away from commercialized tourism.
• Zero light pollution, providing exceptional opportunities for stargazing and astrophotography.
• A quiet environment free from jet skis, loud beach clubs, and heavy vehicle traffic.

Cons:

• Limited medical infrastructure; the nearest hospital may be hours away on the mainland.
• Unreliable power grids; many properties rely on solar power or evening-only generators.
• Lack of air conditioning in budget accommodations, which can be challenging during hot seasons.
• Complicated and weather-dependent transport logistics that can lead to unexpected travel delays.

Key Travel Metrics

• Best Time to Visit: The dry season runs from late November to April. During the southwest monsoon (May to October), many of these islands become virtually inaccessible as ferry services suspend operations due to rough seas.
• Budget: Plan for approximately 1,200 to 2,500 THB ($34 - $70 USD) per day for a comfortable mid-range experience including meals, basic beach lodging, and local transit.
• Safety: These islands are exceptionally safe from violent crime. The primary hazards are natural: sunburn, dehydration, jellyfish stings, and minor scrapes from scooter mishaps. Always carry a basic first-aid kit and check local swimming warnings. For safety guidelines, consult the Thailand safety guide.
• Visa: Most travelers enter Thailand under the Visa Exemption scheme or with a Tourist Visa. Ensure your passport has at least six months of validity remaining.
• Weather: Tropical marine climate. Temperatures average 28°C to 34°C (82°F to 93°F) year-round. Humidity is high, often exceeding 80%.
• Currency: Thai Baht (THB). Cash is absolute king on these islands. Ensure you withdraw ample funds at mainland airports or major cities like Phuket, Krabi, or Ranong before boarding your ferry.
• Transport: Longtail boats, local passenger ferries, and occasional speedboats. Be prepared for wet landings where you must wade through knee-deep water to get from the boat to the beach.
• Recommended Duration: Spend at least 3 to 4 nights per island to justify the transit times and fully immerse yourself in the slow pace of life.
• Internet & Connectivity: Mobile network coverage (AIS and TrueMove) is surprisingly decent on most islands, but speeds can drop during storms. Do not rely on high-speed connections for data-heavy remote work.
• Power Plug: Types A, B, C, and O are used. Voltage is 220V at 50Hz. Bring a rugged power bank to keep your devices charged during scheduled power outages.
• Emergency Numbers: Tourist Police: 1155; General Emergency: 191; Marine Police: 1196.

Practical Itinerary: 7 Days of Seclusion in the Southern Andaman

To experience the best of these remote destinations without spending your entire holiday in transit, we recommend focusing on a specific geographic cluster. This 7-day itinerary connects the quiet coastal spots of Trang and southern Satun, providing a seamless blend of marine adventure and deep relaxation.

Day 1-2: The Cliffs of Koh Lao Liang

Begin your journey by arriving in Trang. Arrange a morning transfer from Hat Yao Pier to Koh Lao Liang Nong. Spend your first two days disconnected from the modern world. Spend your mornings sea kayaking around the dramatic limestone karsts and your afternoons snorkeling amongst vibrant soft corals directly off the main beach. Sleep in high-quality safari tents pitched right on the sand, falling asleep to the sound of gentle waves.

Day 3-5: The Pristine Waters of Koh Bulon Lae

On Day 3, take a pre-arranged speed boat transfer south toward Koh Bulon Lae. Check into a rustic bungalow shaded by casuarina pines. Spend these days enjoying the slow rhythm of the island. Walk along the sandy paths, visit the local school, and watch the Urak Lawoi fishermen bring in their daily catch. Spend your afternoons reading on the quiet expanse of School Beach or exploring the shallow coral gardens of Mango Bay.

Day 6-7: Historical Exploration on Koh Tarutao

Board the morning speedboat south to Koh Tarutao National Marine Park. Check into your DNP-managed bungalow at Ao Phante Melaka. Spend Day 6 renting a bicycle to explore the rugged coastline and hiking up to the Toe-Boo Cliff viewpoint for a panoramic view of the archipelago. On Day 7, hire a longtail boat to visit the historic Ao Talo Wao prison ruins on the eastern side of the island to learn about the WWII pirate history before taking the afternoon ferry back to Pak Bara Pier on the mainland.

Hyper-Local Tips for the Off-Grid Traveler

To ensure a smooth, respectful, and safe journey, keep these highly specific insider tips in mind:

• Phra Thong Wildlife: If you are visiting Koh Phra Thong for birdwatching, hire a local guide with a modified 4x4 vehicle before dawn. The Lesser Adjutant Storks are highly sensitive to human presence and are best observed from a distance using telephoto lenses or binoculars near the inland watering holes.
• Tides Matter: Many hidden islands do not have deep-water piers. Boat arrivals and departures are highly dependent on tides. A low tide can mean wading through 100 meters of shallow water and sharp coral rocks to reach your longtail boat. Always wear sturdy water shoes (reef booties) during transfers.
• Cash Management: When calculating how much cash to bring, estimate your daily expenses and add a 50% buffer. If you decide to extend your stay or require an emergency private boat charter due to changing weather, you will need physical currency to pay the local boatmen.
• Support the Locals: Buy your snacks, fresh coconuts, and souvenirs from small, family-run village shops rather than relying solely on your resort's restaurant. This ensures that your tourism dollars directly benefit the local island communities.

Who Should Visit These Hidden Islands?

These destinations are ideal for travelers who prioritize natural beauty, peace, and cultural authenticity over modern convenience and lively nightlife. If you enjoy reading a book in a hammock, falling asleep to the sound of the wind, and exploring untouched marine parks, these islands will offer an unforgettable travel experience. However, if you require air conditioning, fast internet, nightlife options, or easy medical access, you may prefer more developed destinations like Phuket or Koh Samui. For budget planning on larger islands, see our Phuket budget guide or the Koh Lanta budget guide.

Best Months to Visit

The absolute best window is between December and March, when the monsoon rains have ceased, the seas are calm, and underwater visibility is at its peak. Avoid traveling to these remote locations between June and October, as many of the islands close completely to tourists, and regional boat transfers become highly dangerous due to unpredictable tropical storms.

Next Destination

Once you have experienced the quiet magic of Thailand's remote islands, consider exploring the country's culinary heritage on the mainland. Dive into the world of traditional markets and regional specialties with our comprehensive guide to Thailand street food, or venture north to explore historical temple routes.

Article Methodology & Sources

This comprehensive guide was compiled by our travel editorial team using primary resources, local consultations, and official government data. We have cross-referenced all travel logistics, ferry routes, and national park regulations with official portals to ensure maximum accuracy and reliability.

Key sources used in the creation of this article include:

• Historical records of the WWII penal colony and maritime piracy archives provided by the Department of National Parks, Wildlife and Plant Conservation (DNP).
• Wildlife nesting and conservation status data from the IUCN Red List of Threatened Species regarding the Lesser Adjutant Stork populations on Koh Phra Thong.
• Seasonal ferry schedules, pier accessibility guidelines, and maritime safety notices published by the Marine Department of Thailand.
• Climatological data, monsoon patterns, and seasonal weather averages sourced from the Thai Meteorological Department.