I can only add to what Norm has already suggested. Just pack a positive attitude along with your cruise wardrobe. Get out and mingle. And don't worry if there aren't any other singles onboard. Everyone is there to have a good time, and married couples are fun to hook up with for sightseeing and going to shows with, etc. And even if you are on the shy side, make a real effort to be outgoing and push yourself to be a "joiner."
Good luck, and when you return, please post here on the Singles Message Board and let us know what a wonderful cruise you had.
Pat Hagan, Singles Editor, Cruisemates.com