Railay Island is a peninsula with two wharfs, Aonang Beach and Nammao Pier, from Onan. It feels much better to start at Onan Beach. Mao Pier is 150 B tuk tuk away from town, but two are not the same bay, one is East Bay, the other is West Bay. Phranang Beach is the best place for Railay Island. The beach for swimming is to pass through Dongwan, so hotel reservation is recommended to Dongwan, but the water quality will deteriorate when the tide ebbs. It's not good to swim. There are many monkeys on the island who are not afraid of people but can't feed them. Generally speaking, it's worth staying one or two nights.