Well, if you're staying there, it's already pretty nice. If you want to get out though, would you opt for fine(r) dining, or some local type stuff? For the former, one of my father in law's current favorite restaurants is Casa Italia in San Juan. For the latter, head inland to Guavate and the lechoneras. El Junque is cool if you want to hike it (not difficult), or you could head west to Rincon for surfing. I usually stay in a resort town called Palmas del Mar where my in laws live. Relatively sleepy, upscale community with two golf courses, several really good restaurants, horseback riding, beach stuff, and a casino with $2 minimum bet roulette.