White sand, clear water and Bangkok two hours away — the capital's closest proper beach.
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Koh Samet is small, dry and close: two hours from Bangkok to Ban Phe pier and forty minutes across. The whole island is a national park, which is why the sand is still white and the development is low-rise. Sai Kaew in the north is the busy beach with the restaurants and the fire shows; the bays south of it get smaller and quieter with every headland.

It has a reputation as a party island, which is only true of one beach on Saturday night. Come midweek and Samet is a quiet, rather elegant island with excellent snorkelling off the rocks and a dry microclimate that keeps it sunny when the mainland is grey.
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Buses and minivans run from Bangkok's Ekkamai terminal to Ban Phe in about three hours, and ferries leave Ban Phe for Na Dan pier roughly every hour, taking forty minutes. Speedboats do it in fifteen if you are in a hurry.
Coming from the Gulf coast in the south, the route runs back through Bangkok — Samet is on the eastern seaboard, the opposite side of the bay from Ban Krut.
On the island, green songthaews meet the ferry and run down the east coast. Fares are fixed per beach and rise as the track gets worse.

North for convenience and life, south for silence. Sai Kaew and Ao Hin Khok have the choice and the restaurants; Ao Wai and Ao Kiu are single-resort bays where dinner is wherever you sleep; Ao Prao on the west side is the sunset address.