Have the most fun at sea—and get the best deal around—when you book your Carnival cruise with JetBlue Cruises. Whether you're looking to fill your day to the brim with activities, take it easy at one of the 3-4 pools onboard, or pamper yourself at the spa, the largest and most popular fleet in the world has you covered. Once you get settled in your stateroom, all you have to do is unpack and get ready for the journey of a lifetime, courtesy of Carnival.