Going to Lanta Island must not miss a day trip to ROK Island. ROK Island is the border of southern Thailand, and then to the south is Malaysia. The sea is extremely transparent and clear, and the beach is as fine as flour. It is definitely the best in all islands in Thailand. Snorkeling or lying on the island is enjoyable. ROK Island day trip can only be reached in Lanta. From Lanta Island, take a 40-minute speedboat to this rok island. The sand is like cotton and the water is clear. You can see a lot of fish on the beach, as well as sea cucumbers and sea urchins.