I would love to know this too. I'll be there for my wedding and honeymoon and my fiance loves to dance (I do too!) so I'm sure we'll be looking for all the romantic hot spots. I would love to know about as many beforehand as I can find.
A lot of the big resorts have outdoor bars with music in the evenings. Some have piano bars with a dance floor. The concierge at your hotel will be a big help with pointing you in the right direction for whatever atmosphere you're looking for.