What are some special attractions? what's your best bet?
In the few hours I spent in Puerto Rico many years ago, I thoroughly enjoyed through the tropical rain forest. I also had my first taste of freshly picked pineapple - much better than the taste of pineapples shipped to our supermarkets.
My favorite travel guide has information about the main attractions.
http://www.lonelyplanet.com/worldguide/destinations/caribbean/puerto-rico/