I brought 2 light sweaters to wear in the dining room, lounge etc at night and used them several times...it's true about the sunburn and the ac can get a bit chilly!!! I also brought a pair of linen capri pants that I wore at night in Cozumel. A coverup for the beach and pool was nice to have also...I had a sarong. And, a hat! Bring one...it gets windy and it's also good protection against a sunburned scalp! Have fun!!!