This one-town island offshore from Chonburi Province on the Gulf of Thailand is practically deserted, making it great fun to explore. Its attractions include a meditation centre with hermit caves, decent beaches with good snorkelling, a ruined palace, limestone caves and a Chinese temple perched on a cliff overlooking the sea. Most of the population are fisherfolk, mariners, customs officials or workers in aquaculture projects. Camping is permitted anywhere on the island, but if you don't want to tent it, there are numerous hostels and bungalow-style operations.
To get there, take a bus from Bangkok's eastern bus terminal or from Pattaya to Si Racha, about 105km (65mi) from Bangkok. Boats to Ko Si Chang leave hourly from the pier in Si Racha.