At most of the villas I've stayed at, there are separate towels for the bathrooms and pool area and they ask that you don't take the bath towels into the pool area (because the chlorine bleaches them). I don't think I would hesitate to take the pool towels to the beach or water parks, but I would probably think twice about taking the nice fluffy white ones. You can hire towels from water parks, but the beach could prove a problem. I certainly wouldn't want to fill my suitcases with towels.