http://www.topuertorico.org/tinfo.shtml this should cover all your questions depending where you will stay then you have many choices to eat , do eco tourism but this is my top choises: 1) http://elyunque.com/biolbay.html Bio Bay 2) Yunke 3) Old San Juan 4) Arecibo Radio Telescope still i guess the biggest one until china finish theirs 5) http://www.toroverdepr.com/

as, Jr N. sad, don't try looking for ecotourism over there....they have beautiful fortress from 15th century...europian looking streets, doesn't feel like bein in caribbean...

Look up kayaking in the bioluminescent bay. It's absolutely gorgeous. You can book this with a half day hike in El Yunque National Park, which is also stunningly beautiful.

if you're in san jaun, there is a huge city center with endless streets of history. "the historical district"