Just a quick tip from a recent Liberty of the Seas cruise.
At CocoCay, towels were already gone by around 10am. When leaving the ship, crew were offering pool towels but calling it a “towel exchange,” which made it a bit confusing and sounded like you needed to swap one instead of just taking one.
Many people assumed towels would be available on the island, but that wasn’t the case. There ended up being no towels available there for the rest of the day.
Best move is to grab towels from the ship before heading off.