They offer private weddings and receptions. If it will be just the two of you, you can get married in the private Gazebo they have that's suspended off the water and have a candlelight beach dinner for two followed by a couples massage on the beach. If you are have guest they can accomodate 2 to 150 (it may be more than 150 I'm not sure). I'm getting married there this coming September and I'm super excited.
I agree w justchrissy...the off shore excusions is a great idea (a group catamaran trip to Margaritaville or a trip to the Blue Mountains). They have a ton of possibilities.