The world's largest cruise line, Carnival has more cruises to the Caribbean from more U.S. homeports than any other cruise line. Carnival has been adding features to its existing ships, such as the Seuss at Sea kids program and a series of longer, nine-day-plus cruises with special itineraries called Carnival Journeys. Carnival expects to launch the 4,000-passenger Carnival Panorama in Long Beach, Calif., next year.