There are two major beaches that can be found on the little peninsula of Railay. One of them is the West Beach which is where the boats serving food come up to, and there are bars and restaurants lining up for your business at the edge of the sand. If you are looking for something a little more quiet, I would suggest going to the Phra Nang Beach, or Princess Beach, on the tip of the peninsula. There are a couple of resorts here, but they tried to hide themselves among the jungle so it makes you feel like you are in a more isolated place.
If you are not staying at one of these resorts, you can get there by finding the path on the southern tip of the town. It is an interesting path in itself and worth searching for. It follows along a cliff face and there are many places where you can stop and take pictures of the rock formations that are being created. It is like spelunking without have to travel into the darkness of the caves. It even has many formations that are highlighted for everybody to see. I won’t ruin what they are, but they allow for some fun conversations along the way.
When I went, I was surprised at the crowds I first encountered along the way, and was even more surprised at the tiny beach that could be found at the end of the trail. The map I was looking at showed that the beach extended a lot further down the coast. I found out later that it was because of the tide and the beach was hiding beneath the waves. The crowds came from tour boats and only came once in the morning and then disappeared. They basically stuck to that small sliver of beach and would not venture out to the other side of the beach.
But it only takes a little bit of wading through warm water if you get here during high tide to make it to the other part of the beach, and you leave the crowds behind if you do this. If you come during low tide, you do not have to worry about the crowds or the wading and you can just walk along the beach. It is really worth the trip because there a lot of great formations to explore, and when you get tired of that you can always cool off in the refreshing waters of the ocean. It is one of the hidden gems in this part of the world, and really worth the trouble of getting there.