Even if you don’t get your buns off the beach for the rest of your stay on Samui or Pha Ngan, it’s worth taking at least a day out to visit the beautiful Ang Thong National Marine Park, a lush, dense group of 42 small islands strewn like a dragon’s teeth over the deep-blue Gulf of Thailand, 30km or so west of Samui. Once a haven for pirate junks, then a Royal Thai Navy training base, the islands and their coral reefs, white-sand beaches and virgin rainforest are now preserved under the aegis of the National Parks Department. Erosion of the soft limestone has dug caves and chiselled out fantastic shapes that are variously said to resemble seals, a rhinoceros, a Buddha image and even the temple complex at Angkor.

The surrounding waters are home to dolphins, wary of humans because local fishermen catch them for their meat, and pla thu (short-bodied mackerel), part of the national staple diet, which gather in huge numbers between February and April to spawn around the islands. On land, long-tailed macaques, leopard cats, wild pigs, sea otters, squirrels, monitor lizards and pythons are found, as well as dusky langurs, which, because they have no natural enemies here, are unusually friendly and easy to spot. Around forty bird species have had confirmed sightings, including the white-rumped shama, noted for its singing, the brahminy kite, black baza, little heron, Eurasian woodcock, several species of pigeon, kingfisher and wagtail, as well as common and hill mynah; in addition, island caves shelter swiftlets, whose homes are stolen for bird’s nest soup.

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