The ship supplies pool towels. You can get these on deck 9 prior to all excursions, or as you leave the ship on Castaway. I certainly don't bother taking space in my luggage for beach towels--I'd only have to launder them (hee hee). Obviously, the pool towels are not as big or nice as our "at home" beach towels, but they are quite sufficient. It's just one less thing for you to pack.