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They provide towels for both taking ashore to the beach and also for using around the pool. You just have to show your cruise card. When you hand your towel back they will mark the record that it has been returned. If you fail to return a towel, they charge for it so make sure when you hand them back you don't just dump it in the laundry bin beside the towel desk but make sure they take your cabin number and mark it off the shee.