There is no official guide or website for climbing in Puerto Rico. If you are interested you should call
Aventuras Tierra Adentro and they will be able to offer you some detailed information as to all the climbing areas, etc.
The phone number is 787-766-0470. I am from PR and have climbed in Ciales, which is in the center of the island, and a bit difficult to get to unless you are from the area.
If you need any more info. please let me know and I will try to get it for you.