Koh Mook, a tranquil oasis sandwiched between Krabi and Trang, is best known for its intriguing Emerald Cave, which is set amidst dramatic outcrops, sparkling blue seas and pristine sands, and is believed to be an ancient pirate treasure spot. It is around 80 metres long and opens to a gorgeous beach. A guided journey through the cave provides all the necessary gear and the chance to kayak, swim and take photos. Hikers will delight in the half-day jungle adventure trail, which winds through the dense tropical jungle. Alternatively, explore the underwater world with a snorkelling session at Koh Ngai. Several charming shops, beach bars and restaurants serving up traditional fare add appeal. Make sure to hire a bicycle or motorbike to explore the island in a relaxing and fun way.