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Carnival Cruise Lines emphasizes round-the-clock fun on every sailing. On your Carnival cruise, you'll find dozens of activities, top-notch Vegas-style revues and a variety of nightspots...

Royal Caribbean International sails worldwide. The ships of Royal Caribbean cruise line are relaxed, elegant and upscale, and they have a broad appeal that attracts everyone... 

Norwegian Cruise Line, also known as NCL, operates ships that are classy, comfortable and easy to navigate... 

Celebrity cruise ships are sleek and offer sophisticated touches like a champagne-and-caviar bar, martini bar and hand-rolled cigars and cognac...