I personally do not care if one chooses to wear a thong to the pool. But to those who do , be prepared for stares and snickers from others around you. Chances are that is the attention you are hoping for anyway. All I know is that if my 6 year old and 3 year old see your naked behind, they are going to giggle and sing a little song" I see London, I see France, I see her underpants." Hope you have a sense of humor. Enjoy your cruise.