KO HAI (also known as KO NGAI), 16km southwest of Pak Meng, is the most developed of the Trang islands, though it’s still decidedly low-key. The island’s action, such as it is, centres on the east coast, where half a dozen resorts enjoy a dreamy panorama of jagged limestone outcrops, whose crags glow pink and blue against the setting sun, stretching across the sea to the mainland behind. The gently sloping beach of fine, white sand here runs unbroken for over 2km (though at low tide, swimming is not so good at the northern end, which is scattered with dead coral), and there’s some good snorkelling in the shallow, clear water off the island’s southeastern tip.

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