Sea-canoeing is the perfect way to explore the deep secrets of the sea. The "hongs" are actually collapsed limestone cave systems in the interior of each island, only accessed by tough, purpose-designed inflatable canoes through sea-caves at low tide. With open sky and surrounded with jungle flora and fauna, the hongs reveal a unique eco-system and complete tranquility. Hongs are best enjoyed in the evening with John Gray's 'Hong by Starlight' trip being one of the most popular on the island.