Things to do in Puerto Rico?

Hey, burners. I'm going to puerto rico with company for the weekend, and then some. Question to anyone who's been before or locals, what are crazy people friendly activities there? So I spent time googling for "raves" and "hippies", and the Caribbean side, like aguidilla and rincon, looks promising. We're landing in san juan though, so going to start there. Raves in caves, fires on the beach, hills with significance, nude grottos is the kind of stuff I'm looking for. From reading forums it seems that we'll just walk into the right crowd (or the right cow dung pile) at some point, but general pointers are appreciated.