Secret Beach is actually a small cave that has to be snorkeled through. There is a mysterious isolated beach in the cave. Boats to Secret Beach should not be too close, otherwise they will hit rocks, so they must snorkel through the cave and enter the beach. We had a very rough day. Because the entrance of the cave was too small, we entered the cave safely under the protection of the captain. Secret Beach's cave has a deep trench through which to test shoal rocks. If the wind and waves are very strong, it is easy to hit rocks. But when the waves outside the cave wash out sand, the sea inside is quiet and abnormal. A small rock crevice between leisurely swimming all kinds of small fish, very comfortable.