You’ll go to Puerto Rico for beautiful beaches and Caribbean breezes, but once you’re there, it’s easy to see what makes this archipelago so singular—from historical architecture to its diverse natural geography. Tour San Juan for shopping and sightseeing alongside colorful buildings and cobblestone streets. Hike the massive El Yunque rainforest to explore waterfalls and wildlife. And as far as beaches go, it doesn’t get better than the sands of Isla de Vieques—particularly Mosquito Bay, where at night, the water glows blue-green thanks to bioluminescent organisms. The best part? Puerto Rico’s manageable size means you can see and do a lot in a single trip.