Which things would be te best to take to the beaches of goa?

im going to goa in september and want to know somethings to take to the beaches and i want to know every little things about beaches you know im going in september so i need to take many cloths and my bag is not to big what should i do please tell me !!!!!!!!!!!!!!!! :) ;] please fast i need to a lot of shopping and don't have enough time to choose and if any body can tell me about that please do it fast and i want to now things needed on a beach