Visit the country side of PR
. It is beautiful with a beautiful coastline. The mountain range going E-W through the middle is beautiful. The coastal cities are also very nice. The Camuy Caves are interesting. Of course then there's always El Yunque and Old San Juan. I've never been to dance clubs there so I can't speak to that aspect of it.
As for lodging, if you tour the island, you can't beat the price of the govt run Parador's, but you can beat the quality :-)
BTW: Check out Fodors.com and Frommers.com. They can give you lots of ideas