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I didn't do the excursion through Carnival, but I saw the beach and the bar coming back from Marigot while on the Glory 2 weeks ago. That beach is right across the pier and you can get there on your own with a water taxi. Rule of thumb - you can do everything cheaper on your own than go through the cruise. Also, Orient Beach, where we went on our own, seemed a lot prettier. However, don't know if there was 99c beer on Orient Beach. Drinks, such as pina colada, were $6. If drinking is your only goal, everthing cool beach day might be the best.