Thong Nai Pan Noi and Thong Nai Pan Yai are twin coves that form a scenic double bay and are the most popular beaches in the east and sunrise side of the island. Both beaches are the image of paradise with softly curved white sand bays surrounded by mountains covered in rich tropical rainforest. The surrounding mountains make these beaches fairly inaccessible with a steep and rutted dirt road the only overland option; though road works have commenced to make it a dual lane concrete road, another way to get to there is by boat from Had Rin or Chaloklum.

There is no coral reef on the east coast of the island, and it is possible to swim at both beaches all year round, though Thong Nai Pan Noi is the best as it's the deepest bay. There is little to see in the way of marine life, but there are some decent waves for body surfing. Thong Nai Pan Noi is the most popular of the two beaches with a bohemian vibe and has a small village with some cool bars and restaurants. People get up early for sunrise and long-termers patiently wait to graduate to the coolest of bungalows, beachfront space is premium.

Thong Nai Pan Yai is the longer of the two beaches, the resorts are more spaced out and it has no village, as a result it is quieter than its counterpart. There are numerous trails to walk and waterfalls to visit, and Thong Nai Pan Yai also has a decent set of rocks for experienced climbers. This side of the island is still pretty wild, and the surrounding jungle is haven for many exotic tropical creatures. Giant water monitor lizards, "Takuad" in Thai, can be seen feeding outside the Panviman Resort at sunset and small wildcats have even been spotted deep in the trails.