Which are the best beaches to go in Thailand? Why?

Hi! I need your help! I am going to Thailand for 1 week on July and I dont know to which beach I should go because there are too many. I want to go to a beautiful beach that is clean and that has other attractions besides just swimming on the beach. Do you have any suggestions? Please be specific with names,... show more Hi! I need your help! I am going to Thailand for 1 week on July and I dont know to which beach I should go because there are too many. I want to go to a beautiful beach that is clean and that has other attractions besides just swimming on the beach. Do you have any suggestions? Please be specific with names, descriptions and personal experience. Thank you very much
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