The last island before Cambodia: clear water, coconut plantations and almost nobody.
Find a room before you go.
Koh Kood — Ko Kut on the signs — is the fourth largest island in Thailand and one of the least developed. There is no bank, no convenience store chain and very little nightlife. What there is: a west coast of long empty beaches, two waterfalls, a fishing village on stilts, and water so clear that snorkelling starts at the shoreline.

It has become the eastern seaboard's resort island, but quietly: places are spread along the coast rather than clustered, and most guests come by hotel boat and stay put. If you want a week where nothing happens on purpose, this is the address.
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The route runs through Trat. Buses and minivans reach Trat from Bangkok in four to five hours, or fly to Trat's small airport in under an hour. From Laem Sok pier, speedboats cross to Koh Kood in about an hour.
In high season there are also boats from Koh Chang via Koh Mak, which makes a three-island chain along the eastern seaboard.
Most resorts include the transfer from the pier, and many run their own boats. Ask before you book your own ticket.

Klong Chao is the centre of what little there is: beach, waterfall, a handful of restaurants and the widest choice of rooms. North and south of it, resorts sit alone on their own bays, which is lovely if you want to stay put and inconvenient if you do not.