La Parguera Nature Reserve
Just about as far away from San Juan as you can get is the resplendent La Parguera Nature Reserve, a collection of mangroves, salt marshes, coral reefs, and tiny islands scattered across an expanse of brilliant turquoise water.
What to do there: Snorkel! The calm waters of the reserve are perfect for lazily paddling your way through spectacular reefs. Stick around a couple hours, and you're likely to spot sea turtles, manatees, and dolphins.