You remind me of a girl I met a while back ago. But she was 17 and lied to me telling me she was 18. That's neither here nor there but you are going to have the time of your life. You can go to the night club and that's pretty much the main thing bad for booze if your parents are cool I'm sure you can ask them to buy you one. Carnival doesn't serve minors but they know your on vacation. If you know what I mean. As for off shore, they want your money. They don't ID. Just be safe. Do what I do and write your ship name and cabin number on your body with permanent marker. If you can't tell I like to party and I'm a cruise vet.