Trang province is famous for its breathtaking natural attractions especially a beautiful and unique island called Koh Muk with its attractive sight ‘Tham Morakot’ or Emerald Cave. Koh Muk is a big island of Trang province located in the Hat Chao Mai Marine National Park. There are fisherman village, resorts, restaurant, motorcycle taxis, and rental motorcycles for visitors. Visitors have to pass through a small passage that is accessible during low tide to Tham Morakot which is a large hall without roof with emerald sea and a clean white beach surrounded high cliffs. To fully absorb atmosphere around Koh Muk, it is recommended to have one night stay in the island. Moreover, visitors can have a boat trip to go snorkeling at nearby islands such as Koh Ma, Koh Cheok, Koh Waen.