Hat Sai Kaew - Ao Phai Beach : Koh Samet - Hat Sai Kaew, Koh Samet or Diamond beach is the longest and one of the most popular beaches on Ko Samet. It is located in the North-East and it is about 780 meters long. This is the beach You should choose if you like to have a little people and activities around you, but at the same time live next to a almost paradise-like beach. The sand is almost snow-white and the water is invitingly green-blue. Ao Phai is located near Hat Sai Kaew but both beaches are separated by a rocky outcrop. The beach is about 400 meters long.