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I recently went on a Carnival cruise and used their master card for booking and while on the ship.  Are the points you accumulate enough for two people to take a cruise and how does that work?  Has anyone used their card and gotten a cruise for using it?  I've got the card; I just finished a cruise, but I guess I'm clueless how the point system works.  Does anyone have any experience with this?  Thanks in advance.

Happy Cruising.....Anita