A.W.
I haven't been, but also suggest that you take diapers/wipes and then you can use that room for souviners on the return! And don't forget the swim diapers!!!! and sunscreen! and I would pack some favorite snack too like granola bars, fruit snacks etc....
and one of my favorite things to pack for little ones is a beach ball! super small to pack but blow it up when you get there for tons of fun! Good in the room and at the pool - not so much for the beach! :) Might want to pack a beach bag too - roll it up and stuff it in! and a small floatie thing for your little one.