Railay has several bays, all of which are surrounded by amazing caves and limestone cliffs which are popular with climbers. The sand is clean and white and the water is not littered with rubbish which is a welcome change from many of the beaches and Islands in this region. There are, as many of the other reviews point out, quite a few day trippers to Railay and it does get somewhat crowded but not so much that you feel like you can't find a peace of beach tucked away that is your own little piece of heaven. Unless you trek back to the East side, there is no where to buy snacks and drinks near the caves and rock climbing areas, so take some with you - be warned, the monkey's will try to steal your food and they can get a bit aggressive. If you wander around to the West side of the Island, there are several restaurants with Thai and some western food. At night it is lovely to sit and watch the sunset, this is a popular evening event with visitors, probably because there is nothing else to do on Railay once the sun goes down. Great for all ages.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.