Puerto Rico Pictures

San Juan's lively daytime energy translates into action-packed nightlife — one of many popular draws for tourists. Sean Pavone Shutterstock

You can walk though the six stories of this famous fortress, including a maze of tunnels, barracks and prison cells. dranzi iStockphoto.com

The 27 acres of Castillo de San Cristóbal were built to protect Old San Juan from land attacks. Today, the site offers breathtaking views of the sea.  Terraxplorer Getty Images

If you're staying in San Juan there's a good chance you'll never venture farther than Condado Beach, which frames a string of high-rise hotels. dennisvdw Getty Images

El Morro fort in Greater San Juan is one of the most popular attractions in Puerto Rico, in part for its rich ties to the island's past.  Ksaraf Wikimedia

Alcapurrias are a popular beef fritter dish in Puerto Rico, and one of the best street dishes, or comida criolla, to try on vacation.  Dave Cook Flickr

Families flock to this shore for its reef-protected calm waves, and you'll see a lot of daytrippers fresh from a jaunt in El Yunque rainforest. arenacreative Getty Images

Just 35 miles east of San Juan, El Yunque rainforest is a great picture-taking and hiking opportunity. epslight Getty Images

This Vieques beach is the only one of the tiny island with public facilities; the town of Esparanza is just a short walk away. MsDivinity Flickr

Located near the Isla Verde resort area in San Juan, the Balneario de Carolina is often crowded.  runneralan2004 Flickr

Puerto Rico's many beaches line its expansive shoreline. The Arecibo beach area shown here is a ways away from the hustle and bustle of the downtown San Juan. LeisureCowboy Getty Images

Calle del Cristo is lined with pastel-hued buildings, cobblestone streets and many shops, bars and eateries. Erin Shields USN&WR

Flamenco Beach is often regarded by travelers as the most beautiful beach in Puerto Rico for its clear, shallow waters, soft sands and remote location.  ARENA Creative Shutterstock