Most people try to do all of southern Thailand’s islands in a week and end up spending half the trip on ferries. Twelve days is enough to actually settle into each island instead of just passing through it.
Overview
This route covers the Gulf of Thailand islands — Koh Samui, Koh Phangan, and Koh Tao — connected by regular ferries, rather than the Andaman side islands, which need a different route entirely. Four days on each island is enough to find a rhythm without feeling rushed.
Day by day
Days 1–4, Koh Samui. The most developed of the three, with the easiest transport and the widest range of accommodation. Good for easing into island time and a base for day trips to Ang Thong Marine Park.
Days 5–8, Koh Phangan. Known for Full Moon parties, but there’s a much quieter side to the island away from Haad Rin. Thong Nai Pan in the northeast is a good base if you want the beaches without the party crowd.
Days 9–12, Koh Tao. The smallest of the three and the best for diving — this is where most people get certified if they’re going to. Even without diving, the snorkeling off the northern beaches is worth the stop.
Getting between islands
Ferries run regularly between all three islands, and tickets are easy to book a day or two ahead rather than far in advance. Speedboats cut the travel time roughly in half over the slower car ferries, for a moderate price difference.
Choosing your pace
- If you only want two islands, drop Koh Samui and start on Koh Phangan — Samui is the most “any beach town” of the three
- If diving is a priority, weight the trip toward Koh Tao and consider adding two or three extra days there for a full certification course
- Avoid planning tight connections around the Full Moon Party dates on Koh Phangan unless you’re specifically going for it — accommodation prices spike and ferries get fully booked
Budget note
This itinerary assumes a comfort-level budget — private bungalows or boutique hotels rather than hostels, and a mix of restaurants rather than street food throughout. It’s easy to bring the cost down significantly by shifting to guesthouses and local food, especially on Koh Phangan and Koh Tao where budget options are plentiful.
