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When you check in they give guests "towel cards". You can exchange them at the poolside surf desks for clean towels at any of the resorts. Give a card, get a towel. Give back a used towel, get a card or a clean towel. You can then take your card to any of the sister resorts (there are 3 next to each other along the beach) and get towels at any pool. Then just return them at that pool and walk home with a clean card, rather than a wet, sandy towel.