You're on a cruise, so definitely enjoy it :) My advice would be to stick to vodka/clubs. Club Soda has 0 calories and vodka has less calories than other liquors. I know we don't count calories on SB and I don't think vodka is really legal, but if you're looking to maintain your weight I have been known to stick with those. Add a fresh lemon or lime and it's yummy. Or vodka/diet cola/diet sprite. Also yummy.

And for the pp who mentioned margaritas, I bought my Mom a bottle of the "Skinny Girl" margarita (created by one of the Real Housewives, blech) but it's a pre-made bottle with lime juice and agave nectar. My Mom thought it tasted really good and she hates margaritas that are loaded with sour mix.