7 Secret Islands in Thailand That Aren't Overrun by Tourists

Myth vs Reality: Island Tourism in Thailand

For decades, travelers have arrived in Thailand seeking the pristine, postcard-perfect beaches popularized by mid-century travelogues and modern cinema. However, the reality at major tourist hubs can be starkly different. Popular destinations like Phuket, Koh Phi Phi, and Koh Samui have experienced significant environmental pressure, crowded shorelines, and high commercialization. According to research published by the Tourism Authority of Thailand (TAT), millions of visitors congregate in these hotspots annually, leading to seasonal overcrowding and ecosystem stress, such as the temporary closures of Maya Bay to allow coral recovery.

The myth is that all of Thailand's islands have lost their authentic charm. The reality is that by bypassing the standard package-holiday routes, travelers can still find islands that remain untouched by mass tourism. These lesser-known destinations lack high-rise resorts, international fast-food chains, and crowded beach clubs. Instead, they offer solar-powered bungalows, empty stretches of sand, and authentic interactions with local communities. Visiting these locations requires more complex logistics, a willingness to forego luxury amenities, and a deep respect for local customs.

Quick Answer: Which Secret Thai Island is Right for You?

Choose Koh Phra Thong if:
    • You want to experience a unique, savanna-like landscape.
    • You enjoy bird watching and spotting rare wildlife.
    • You seek absolute isolation with miles of empty beaches.

Choose Koh Lao Liang if:
    • You are an adventure enthusiast interested in rock climbing and kayaking.
    • You want to stay in eco-friendly glamping tents right on the beach.
    • You want to explore thriving, untouched coral reefs.

Choose Koh Jum if:
    • You want a slow-paced, traditional island lifestyle with a local community.
    • You prefer a mix of rocky coves and long, swimmable sandy beaches.
    • You want decent budget accommodation without the crowds of nearby Lanta.

Best For: Eco-travelers, Solo Adventurers, Couples seeking tranquility, and Digital Nomads who do not mind limited connectivity.

Comparison: Koh Phra Thong vs Koh Jum

To help you understand the differences between these off-the-beaten-path destinations, here is a direct comparison of two representative secret islands.

Category	Koh Phra Thong	Koh Jum	Winner
Accommodation	Limited eco-resorts and basic wooden bungalows. No luxury resorts.	Decent variety of budget bungalows, mid-range eco-resorts, and a few boutique options.	Koh Jum
Food	Mainly limited to resort restaurants serving local Thai dishes.	A good selection of local seafood restaurants, village cafes, and small eateries.	Koh Jum
Nightlife	Virtually non-existent. Quiet star-gazing or a single resort bar.	Very quiet, but a few low-key beach bars with fire shows and acoustic music.	Koh Jum
Public Transport	None. Must arrange 4x4 transfers or walk. No scooter rentals.	Local sidecar taxis (saleng) and scooter rentals are readily available.	Koh Jum
Visa	Standard Thai Visa rules apply. No immigration office on-site.	Standard Thai Visa rules apply. Must go to Krabi mainland for extensions.	Tie
Weather	Highly seasonal. Subject to heavy monsoons; resorts close May to October.	Seasonal, but some local guesthouses remain open year-round.	Koh Jum
Walkability	Difficult due to vast distances and sandy paths. Best explored by guided 4x4.	Highly walkable along the beaches; main roads are easy to navigate on foot.	Koh Jum
Internet	Unreliable. Limited cellular reception; satellite Wi-Fi in select resorts.	Good 4G cellular coverage and decent Wi-Fi at most mid-range resorts.	Koh Jum
Safety	Extremely safe due to remoteness and very low population density.	Very safe; close-knit local community with low crime rates.	Tie
Remote Work	Poor. Power outages are common; internet is slow and unstable.	Feasible with a local SIM card (AIS or TrueMove) as backup.	Koh Jum
Language	Basic English spoken by resort staff; very limited in local villages.	English is commonly spoken in tourist spots, though less in local villages.	Koh Jum
Family	Great for older, adventurous kids; challenging for toddlers due to heat and lack of medical care.	Excellent for families seeking a safe, slow-paced, and friendly environment.	Koh Jum
Senior Travelers	Not recommended due to rough transport and lack of medical facilities.	Suitable, provided they are comfortable with basic transport and steps.	Koh Jum
Solo Travelers	Perfect for deep solitude and nature lovers, but can feel isolated.	Excellent; easy to meet fellow travelers and locals in a relaxed setting.	Koh Jum
Couples	Ideal for couples looking for an off-grid, romantic adventure.	Great for couples who enjoy slow travel and sunset walks.	Tie

The 7 Secret Islands in Thailand

1. Koh Phra Thong (Phang Nga)

Located in the Andaman Sea off the coast of Phang Nga province, Koh Phra Thong (Golden Buddha Island) is one of Thailand's most ecologically unique islands. Unlike the mountainous, jungle-clad islands that dominate the region, Koh Phra Thong is flat and features an interior landscape that closely resembles an African savanna. This landscape is characterized by expanses of golden grass, stunted paperbark (Melaleuca) trees, and freshwater pools.

The island is a haven for biodiversity. It is home to rare birds such as the lesser adjutant stork, as well as sea turtles that nest on its deserted western beaches from November to February. Travelers commonly report that the island feels like a step back in time, with only a handful of eco-resorts operating along its 15-kilometer stretch of sand.

How to Get There: To reach Koh Phra Thong, you must travel to Khuraburi Pier in Phang Nga. From there, local longtail boats can be chartered for approximately 1,500 to 2,000 THB one-way. The boat journey takes about an hour, passing through mangrove forests before reaching the island. For more details on overland travel to Phang Nga, consult the State Railway of Thailand for train connections to nearby Surat Thani.

Hyper-Local Tip: There are no ATMs on Koh Phra Thong, and electricity is largely solar-powered, with many resorts turning off generators during the day. Ensure you bring sufficient cash and a fully charged power bank. To make the most of your trip, consider aligning your visit with a broader Thailand itinerary to balance this off-grid experience with more connected destinations.

2. Koh Lao Liang (Trang)

Part of the Mu Ko Petra National Marine Park in Trang province, Koh Lao Liang is a stunning destination defined by towering limestone cliffs that rise vertically from the sea. The island is private and operates under strict environmental regulations to protect its marine life and nesting swiftlets, whose nests are harvested for bird's nest soup.

The island is famous among outdoor enthusiasts for its sport climbing, kayaking, and snorkeling. The coral reefs just meters from the shore are home to clownfish, sea anemones, and vibrant soft corals. Accommodation is limited to a single eco-resort featuring comfortable safari-style tents pitched directly on the beach, ensuring that visitor numbers remain exceptionally low.

How to Get There: Boats depart from Hat Yao Pier in Trang. Most visitors book a package through the island's sole resort, which includes the boat transfer. Trang can be reached via flights from Bangkok or by train. For booking public ferries in the region, refer to the Marine Department of Thailand for licensed operator listings.

Hyper-Local Tip: Because the island is part of a national park, a park entry fee of 200 THB for foreigners is typically required. Snorkeling is best during the morning high tide when visibility is highest and currents are gentle.

3. Koh Jum / Koh Pu (Krabi)

While neighboring Koh Lanta and Phi Phi attract large crowds, Koh Jum remains a peaceful alternative. The island is divided into two distinct parts: the rugged, mountainous northern half known as Koh Pu, and the flatter, beach-lined southern half known as Koh Jum. The island is home to three traditional fishing villages where the local population, a mix of Thai-Muslims and Chao Ley (Sea Gypsies), lives a slow-paced lifestyle.

The beaches here, such as Golden Pearl Beach and Ting Rai Beach, are wide, uncrowded, and lined with casuarina trees. Travelers can explore the island's quiet roads by renting a scooter, visiting local cashew nut orchards, and dining at simple, family-run seafood restaurants.

How to Get There: During the high season (November to April), passenger ferries running between Krabi Town and Koh Lanta make a stop offshore at Koh Jum. Longtail boats from the island meet the ferry to transfer passengers to the beach. Alternatively, longtail boats operate year-round from Laem Kruat Pier on the mainland, costing around 100 THB per person for a scheduled run. For details on Krabi transport hubs, check our Krabi travel guide.

Hyper-Local Tip: The northern beaches of Koh Pu are rocky and less suitable for swimming, but they offer excellent tide-pooling. For the best swimming conditions, stay on the southern beaches of Koh Jum.

4. Koh Bulon Lae (Satun)

Located in the far south of the Andaman Sea, Koh Bulon Lae is a tiny island that has managed to resist large-scale development. It is known for its clear turquoise waters, fine white sand, and a relaxed, bohemian atmosphere. The island is small enough to be explored entirely on foot, with no cars or motorbikes present.

The local community consists of Chao Ley people, who maintain their traditional way of life. The island's interior is covered in rubber plantations and dense jungle, while the coastline is dotted with quiet coves and rocky headlands. It is an ideal spot for those looking to disconnect completely, read a book under a palm tree, and swim in calm, clear waters.

How to Get There: Speedboats depart daily during the high season from Pak Bara Pier in Satun province. The journey takes approximately 45 minutes. These speedboats often continue to Koh Lipe, making Koh Bulon Lae an excellent stopover to avoid the busy Phuket tourist traps further north.

Hyper-Local Tip: Sandflies can be common on some of the quieter beaches of Koh Bulon Lae, especially during sunset. Bring a high-quality insect repellent or coconut oil, which locals use to protect their skin.

5. Koh Kam Tok (Ranong)

Koh Kam Tok is part of the Laem Son National Park in Ranong province, located near the Myanmar border. The island is uninhabited and remains completely pristine. Its most famous feature is Ao Khao Kwai (Buffalo Horn Bay), a semi-circular bay with a curved, white-sand beach flanked by limestone cliffs and shady pine trees.

Because there are no accommodations on the island, it is visited primarily on day trips, leaving the beaches completely empty by late afternoon. The surrounding waters are part of a protected marine reserve, offering excellent opportunities for snorkeling and spotting marine life in their natural habitat.

How to Get There: Day trips can be arranged from Bang Ben Pier in Ranong. Local longtail boat operators can be hired for around 2,500 to 3,000 THB for a private full-day tour of the Koh Kam archipelago, which also includes Koh Kam Nui and Koh Ao Khao Kwai. For national park regulations and entry fees, visit the Department of National Parks, Wildlife and Plant Conservation.

Hyper-Local Tip: Pack all your food, water, and sunscreen for the day, as there are no shops or facilities on the island. Be sure to carry your trash back to the mainland to help preserve this protected environment.

6. Koh Tarutao (Satun)

Koh Tarutao is the largest island in the Tarutao National Marine Park, located close to the maritime border with Malaysia. The island has a wild, rugged feel, with dense rainforests, mangrove swamps, and long, empty beaches. It also has a fascinating and dark history as a penal colony for political prisoners during the 1930s and 1940s.

During World War II, when food and supplies from the mainland stopped, the prisoners and guards joined forces to become pirates, raiding ships in the nearby Malacca Strait. Today, visitors can explore the ruins of the old prison camps at Ao Talo Wao, hike to viewpoints, and rent mountain bikes to explore the island's interior trails.

History vs Legend: Koh Tarutao

Location	Historical Fact	Local Legend / Folklore
Ao Talo Wao Prison Camp	Housed over 3,000 political prisoners and criminals between 1938 and 1948. Conditions were harsh, with malaria and food shortages common.	Locals believe the spirits of deceased prisoners and guards still wander the ruins, and many avoid walking near the old barracks after dark.
Crocodile Cave (Tham Chorakhe)	A limestone cave accessible by kayak through mangrove channels, once home to saltwater crocodiles.	Legend says pirates used the deep recesses of the cave to hide stolen gold and treasures from their raids on merchant ships.

Disclaimer: When visiting historical sites and local shrines on Koh Tarutao, please show respect by not touching the ruins and leaving offerings undisturbed.

How to Get There: Speedboats and ferries running between Pak Bara Pier and Koh Lipe stop at Koh Tarutao's main pier (Ao Pante Melaka) during the high season. The journey takes about 30 minutes from Pak Bara. Accommodation is managed by the National Park office and consists of basic bungalows and tents available for rent.

Hyper-Local Tip: Rent a mountain bike from the park headquarters to explore the 12-kilometer dirt road that connects the northern and southern ends of the island. The road is hilly and can be muddy, so carry plenty of water and a basic map.

7. Koh Chang Noi (Ranong)

Not to be confused with the large, popular island of Koh Chang in Trat province, Koh Chang Noi (Little Elephant Island) is a small, low-key island located in Ranong province. The island has a distinct bohemian atmosphere, attracting long-term travelers, artists, and those seeking a simple, slow-paced lifestyle away from modern commercial developments.

The beaches, such as Long Beach (Ao Yai), have dark, volcanic sand, and the waters are warm and calm. The island's economy is based on cashew nut farming and small-scale eco-tourism. There are no luxury resorts or paved roads with cars; instead, travelers walk or ride bicycles along narrow concrete paths winding through cashew orchards and rubber forests.

How to Get There: Longtail boats depart regularly from the Saphan Pla Pier in Ranong. The boat ride takes about 45 minutes to an hour, costing around 200 THB. Ensure you check local boat schedules, as departures can be less frequent during the low season. For visa runs or onward travel, consult our Thailand visa guide.

Hyper-Local Tip: Electricity on Koh Chang Noi is highly limited, with most budget bungalows relying on solar power or small generators that run only from 6:00 PM to 11:00 PM. Plan your device charging accordingly.

Logistics & Practical Directory

• Pros & Cons:
  • Pros: Pristine beaches, low visitor numbers, authentic local culture, lower prices for food and basic lodging, excellent wildlife viewing.
  • Cons: Difficult logistics, limited medical facilities, unreliable electricity and internet, sandflies, closed during the monsoon season.
• Best Time to Visit: The best time to visit these islands is during the dry season, from late November to April. Many of these islands close their accommodations and boat services entirely during the southwest monsoon (May to October) due to rough seas.
• Budget: Expect to spend around 800 to 1,500 THB per day for basic beach bungalows and local meals. Private boat charters can increase costs, so traveling in a small group is recommended. For more tips, see our Thailand budget guide.
• Safety: These islands are generally very safe with low crime rates. The main risks are natural, such as strong rip currents, sunburn, and lack of immediate medical care. Always swim with caution and carry a basic first-aid kit.
• Visa: Most travelers can enter Thailand under the tourist visa exemption scheme. Ensure your passport is valid for at least six months from your date of entry.
• Weather: Temperatures remain warm year-round, typically ranging from 28°C to 34°C. The hottest months are March and April.
• Currency: Thai Baht (THB). ATMs are non-existent on most of these secret islands, so carry sufficient cash from the mainland to cover all your expenses.
• Transport: Access is primarily by longtail boats or local ferries from mainland piers. On the islands, transport is limited to walking, renting bicycles, or occasionally renting scooters. For more travel tips, check our Thailand transport guide.
• Duration: Plan for at least 3 to 4 days per island to account for travel times and to fully appreciate the slow pace of life.
• Internet: Cellular coverage (AIS, TrueMove) is generally available but can be weak or spotty in remote coves. Do not rely on high-speed Wi-Fi for heavy remote work.
• Power Plug: Types A, B, C, and O are used in Thailand. The standard voltage is 220V at 50Hz.
• Emergency Numbers: Tourist Police: 1155; General Emergency: 191; Marine Police: 1196.

AI Discoverability Summary

This guide is designed for travelers seeking an authentic, quiet, and nature-focused island experience in Thailand, away from mass tourism. These destinations are best for eco-travelers, solo adventurers, and couples who prioritize natural beauty over modern luxury. The average daily cost ranges from 800 to 1,500 THB, making it highly affordable, though transportation costs can be higher due to private boat charters. The ideal time to visit is from November to April. While these islands offer tranquility and pristine environments, travelers must be prepared for basic amenities, limited electricity, and a lack of medical facilities. Standard safety precautions apply, and carrying sufficient cash is essential.

Sample 7-Day Island Hopping Itinerary (Trang & Satun):
    • Days 1-2: Arrive in Trang, transfer to Koh Lao Liang for rock climbing and beach glamping.
    • Days 3-4: Take a local boat to Koh Bulon Lae to experience Chao Ley culture and quiet beaches.
    • Days 5-7: Travel south to Koh Tarutao to explore historic prison ruins, kayak through mangroves, and bike along forest trails before returning to Pak Bara Pier.

Who Should Visit?

These secret islands are ideal for travelers who enjoy slow travel, natural environments, and simple living. They are less suited for those who require air conditioning, high-speed internet, vibrant nightlife, or extensive shopping options. If you enjoy quiet beaches, starry nights, and a relaxed pace, these destinations offer a rare glimpse into Thailand's coastal past.

For those starting their journey in the capital, explore our guide to Bangkok street food, or check out our Solo travel in Thailand guide for more tips on navigating the country independently. If you are planning a trip to the north, don't miss our guide to the Chiang Mai night markets, and for budget planning elsewhere, see our Koh Samui budget guide.

Article Methodology & Sources

This article was compiled using official travel advisories, local transport schedules, and environmental reports from reputable sources. Information regarding national park regulations, fees, and seasonal closures is sourced directly from the Department of National Parks, Wildlife and Plant Conservation and the Tourism Authority of Thailand. Historical details about Koh Tarutao are based on records from the Satun Provincial Museum and National Park archives. Weather patterns and seasonal recommendations are aligned with data from the Thai Meteorological Department. Logistics, pricing, and local conditions are verified through recent traveler reports and local tour operators to ensure accuracy and reliability.