Go to the interactive section on this board and check out Meet on board. If you can't find anyone there try cruisecritic.com they have a rollcall also for different ships and dates. good Luck and happy cruising.
I will be sailing on the Majesty of the Seas the same date as you. Taking my niece on a cruise. Promised her a trip after she turned 21 - she chose a cruise that way she could go to the casino's as well as have a dolphin encounter.