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The fort in San Juan is nice, phosphorescent bay, el yunque...bring a macro for coquis, all of the towns have central squares which are really cool, paso fino horses are common to see, aricebo observatory, a mahogany forest at Guajataka if you're a Scout, chicken fights if you're into that, the Southwest section has a desert park...I can't remember the name.
One can snorkel year round and it's like being in a warm bathtub full of the fish you see in petland, if you have some underwater gear then things could be nice.
I loved Puerto Rico, we were stationed there for 4 years. Nearly every street will have something to photograph. The culture is rich, the people are friendly, and everyone speaks english (if they want too).