Koh Nang Yuan – Located in Southern Thailand. Koh Nang Yuan is a small island very near to Koh Tao (an economical boat ride away). It’s famous with day tourists, divers and snorkelers. It’s definitely one of the loveliest islands in Thailand with extraordinary beaches and a dreamy traffic-free calmness. The only place to stay on the island is the Nang Yuan Diving Resort, if you want to stay make sure you reserve as far in advance as possible.