I haven't done the blue lagoon excursion. I am considering it for our Nov. cruise. I believe they will give you towels from the ship. I didn't take any towels during the last cruise. When we got off at Castaway Cay they gave us towels. I beleive it is the same for an excursion if you booked through DCL. It saves a lot of luggage room. I would be sure to take sunblock, & maybe a disposible underwater camera. What about a frisbee? Also, you will pay about $3 a bottle of water. Either bring some or refill theirs to save the $ for better things. Hope you get some more input!
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