Rise with the sun and carve up some waves with WoW Surfing School. Rinse off and score some retail therapy in Old San Juan, where the seven blocks are filled with boutiques, cafes and restaurants. Stop at the kiosks along the road to pick up a picnic and drive 30 minutes to El Yunque National Forest for a hike among waterfalls and coqui, tiny tree frogs native to Puerto Rico. come nightfall, head to Fajardo's Bio Bay, located in a natural reserve dotted with mangroves. Kayak into the darkness and watch the water come alive with millions of glowing microorganisms, known as dinoflagellates. Look for shooting stars and distinct constellations.