I agree with the Duke of Cool- I would opt for the surf lesson, no need to ruin your trip- taking a spill on the reef and cutting yourself up... get in touch with an instructor and he will have a good board for you and take you to the best beach for the swell that day. traveling outside of rincon for waves could be a bad idea if your not experienced surfing reefs and bigger waves. either get a hold of an instructor or go to Marias to get your bearings...
surfer's beach is by Ramey airport, not to be confused with the San Juan airport that you're flying into. Surfer's is a pretty harmless beach compared to some of the other ones. if you go to marias, watch out for a submerged jetty at the north end of the break, it's usually hovering right at the water line so you can't always see it.