Also El Natural is just north of crash boat and a different style dive. Can be shallow or deeper as desired, similar sea life to Crash Boat but never saw a turtle there. More spread out than Crash Boat so nice if you like to swim more. Small (very small) canyons to explore with fish in them.
If you go, talk to an LDS (PR Dive is only one I recommend) for info on currents when you plan to go. When we went Cris (at PR dive) told us to be done by 9am and he was right on — shortly after that the current switched from south to north (pushing us north) and made for a hard swim back, but we were close to the exit by then so was fine. I wouldn’t say it is dangerous, if you keep your head, just could be no fun if you had to land on shore north of the exit point and hike back on the rocky beach. It isn’t so far north that you would miss the entire island if you swam cross current to the beach.