Hey mon, for this party to really fly you will need to play up the rum and the reggae as much as possible! If your budget allows, hire a band to play reggae throughout the evening and your guests will not be able to contain themselves from getting up and dancing away! For a less expensive alternative, hire a DJ to play lots of reggae and beach music (Bob Marley, Jimmy Buffet, and the Beach Boys).
You may want to organize a beach volleyball tournament for your guests, or hold a limbo competition. Check out the Limbo Kit to make it easy!
At the end of the evening, a bonfire would be a nice activity to do -especially if you are holding your party at the beach. Turn the music down a notch and grab some rum punch to relax to the soft rhythm in the background.