I've booked my family on our first cruise!!!! My children are 4 and 7, and we'll be on Carnival's Jubilee on May 22nd. Does anyone have any advice on Carnival cruises with small children? We're only in Cozumel for one day, and I want to make the most of the day without spending a fortune. My kids are excellent swimmers, and love snorkeling, so I'm hoping to go to the Marine Park on our own. Any advice?