Carnival Cruise Lines: cruise ship vacations, cruise deals
Cruises to the Caribbean, Mexico, Alaska and Hawaii. Information about destinations, excursions, and life on board.
http://www.carnival.com/
Princess Cruises : Cruises to Alaska, the Caribbean, Europe .
The cruise line that brought you the Love Boat.
http://www.princess.com/
Royal Caribbean International - Royal Caribbean Cruise Lines
Provides premium cruises worldwide. Includes destinations, ships, services, and packages available, letter from the president, and FAQ.
http://www.royalcaribbean.com/