Group of my friends and I are looking at putting together a 'friends vacation' for November of next year and are planning to do a cruise. While discussing options I remembered seeing stuff about the Amex Cruise Privilege program, and while looking at it, seems like they offer onboard credits, small perks, and bonus points. From what i can tell a balcony stateroom on Royal Caribbean gets $200 in shipboard credit from Amex, and currently RC has a deal offering $300 in credits. Do they stack? Some googling lead to mixed results but hopefully someone has some experience.....