Ao Tubtim is a small bay on the east coast of Koh Samet in Rayong Province, nestled between Sai Kaew Beach and Ao Vong Duen. The bay faces east and receives the northeast monsoon winds from November to March.

A compact spot suited for intermediate riders. The bay is small with limited riding space. Sandy bottom and clear water. Some rocks on the edges of the bay require attention. Less crowded than Sai Kaew Beach but still a popular tourist beach. Best when NE winds are steady.