San Juan is fucking awesome! If you're just in it for the club scene you better speeka da spanish though
If you go into the city at night, you'll see alot of girls, but watch out for the g-dawn gangstas, they do start shit when they see a white boy walking up... (and I'm half rican, so if you're full bred white boy you better bring some friends).
If you go though, do yourself a favor and go to the rain forest, you never know if it's the only chance you'll get to see it.
Just my

I've been there 3 times, if you have any other questions just post 'em.
Cya,
Dave
P.S. Playa Del Mar is the fucking bomb resort, pricey, but worth it.