LOL thanks for the advice. I'll be going solo as my friends are busy and out of town that week (thus precluding more traditional land-based birthday festivities), so it's nice to know I'll still get free cake and the crew will sing even if I am not traveling with a huge posse.
Somehow I don't think my "birthday suit" will be a good idea to wear to dinner or any of the other Halloween events on board

...still trying to think of real costume ideas...or are those mostly a crew thing?