Sneaking would not be the word I would use. We just take it on. Carnival does allow 1 bottle of wine per person I think. Check that out with your PVP before you go. But I just make sure I purchase liquor in plastic bottles, put them in two zip lock bags, just to make sure, & put it in the middle of my luggage. Not your carry on. I have seen several people loose their loot with booze in the carry on. I have taken wine & hard liquor this way.