"No trip to Puerto Rico is complete without a visit to the island of Vieques (30 minutes by ferry from the mainland). And while you're there, you'll want to experience the otherworldly, glow-in-the-dark blue of Bioluminescent Bay (a.k.a. Mosquito Bay) after dark. As you glide your clear-bottomed kayak into the bay, the underwater world beneath you will be lit up by the ocean's equivalent of fireflies. To say it's magical is an understatement." - Travel + Leisure Editors