Thailand's Islands: Spoiled for Choice
Thailand has hundreds of islands scattered across the Gulf of Thailand and the Andaman Sea, ranging from internationally famous resort destinations to tiny, near-uninhabited gems. Choosing the right island for your trip depends on what you're looking for — party atmosphere, family relaxation, world-class diving, or raw natural beauty.
Gulf of Thailand vs. Andaman Sea
The two coastlines have different monsoon seasons, which affects when you should visit each.
| Feature | Gulf of Thailand | Andaman Sea |
|---|---|---|
| Islands | Koh Samui, Koh Phangan, Koh Tao | Phuket, Koh Lanta, Koh Phi Phi |
| Best season | December – August | November – April |
| Monsoon | September – November | May – October |
| General vibe | Lively, accessible, varied | Stunning scenery, clear water |
Island-by-Island Guide
Phuket — For First-Timers & Those Who Want It All
Thailand's largest island is a full destination in itself. Patong Beach offers non-stop nightlife; Kata and Karon are more relaxed family beaches; the Old Town is full of Sino-Portuguese architecture and excellent restaurants. Phuket is the most connected island — with an international airport — making it easy to reach from anywhere in the world.
Koh Samui — For Comfort and Luxury
The second-largest island has matured into a polished resort destination with a strong selection of upscale hotels, spas, and restaurants. Chaweng Beach is the busiest strip; Bophut's Fisherman's Village offers a charming alternative. Samui also has its own airport with direct connections.
Koh Phangan — For Full Moon Parties & Laid-Back Escapes
Famous worldwide for its monthly Full Moon Party on Haad Rin beach, Koh Phangan has another side entirely — quiet northern beaches like Bottle Beach, yoga retreats, and beautiful jungle interiors. Timing your visit around (or away from) the full moon will shape your entire experience.
Koh Tao — For Divers & Snorkellers
One of the world's most popular places to get a PADI open water diving certification, thanks to clear water, abundant marine life, and affordable dive schools. The island is small enough to explore in a day, and the coral reefs are genuinely impressive. Less developed and less commercial than its neighbours.
Koh Lanta — For Families & Slow Travellers
A long, peaceful island on the Andaman coast with a relaxed pace, beautiful long beaches, and a charming old town on stilts. Koh Lanta attracts those who want beauty without the noise. Excellent for families, long-stay travellers, and those with a taste for local Malay-influenced culture.
Koh Phi Phi — For Scenery Seekers
The dramatic limestone karst cliffs and turquoise bays of Koh Phi Phi are jaw-dropping. Maya Bay (made famous by the film The Beach) is accessible by day trip. The main village gets crowded, so stay for the sunsets and day-trip to the most scenic spots early in the morning.
Koh Yao Noi & Koh Yao Yai — For Off-the-Beaten-Path
Nestled between Phuket and Krabi in Phang Nga Bay, these two islands remain largely rural and unhurried. Traditional fishing villages, rubber plantations, and extraordinary sea views with limestone karsts. A rare chance to see an older, quieter Thailand.
How to Get to the Islands
- Most islands are reached by ferry from the mainland. Schedules and routes vary by season.
- Phuket and Koh Samui have airports; others require ferry connections from Surat Thani, Krabi, or Chumphon.
- Plan overnight journeys strategically — an overnight train to Surat Thani followed by a morning ferry is a classic and scenic route to the southern islands.
Whatever your island style, Thailand's coastline will deliver. The hardest part is choosing where to start.