This article is from the Puerto Rico FAQ, by Zeydy Ortiz Laureano firstname.lastname@example.org with numerous contributions by others.
There are many places to visit in Puerto Rico. You can stay in San
Juan and visit many historic places dating back to the days of the
colonization. You may also want to go around the island and discover
many other interesting places such as El Yunque - our National Rain
Forest - in Rio Grande, the Arecibo Observatory and the Rio Camuy Cave
Park in and near Arecibo or Hacienda Buena Vista in Ponce.
In the following sections you will find a partial list of the many
places you can visit arranged by region. Whenever available, I have
included a telephone number where you can get more information about
the place, the hours of operation and a brief description. Some of
these places charge a fee and the schedules are subject to change.
From "Que Pasa - Official Guide to Puerto Rico" and "AAA Travel Book -
Bermuda, the Bahamas and Islands of the Caribbean - 1995"