This was our first trip here, and I did some research for major attractions on the Internet, and of course at RCI, before we went to Puerto Rico. No need for the Frommer's handbook when you have RCI's community journals!
We stayed at Dorado, which is 25 minutes west of San Juan depending on the traffic. It is a central location for the Arecibo Obervatorio, Camuy Caves, Bacardi Rum Distillary, El Yunque Rainforest, Plaza de las Americas (humongous mall), and Old San Juan.
Quick Tips:
We didn't find many discounts in Puerto Rico. We didn't find the typical coupon books, like the ones you find at major vacation destinations, but hotels and visitor centers offer magazines where you can find a few deals at restaurants and major sights to visit.
Best Way To Get Around:
Do rent a car, and I highly recommend paying for the extra automobile insurance. Drivers are crazy there, so watch out. Locals seem to break all traffic violations, so watch out!