There is so much to see and do in Puerto Rico that the unaware visitor might be overwhelmed and end up missing some of the best sights the island has to offer. To help you prioritize, here are the top 5 attractions on the island. Included are an ancient fortress; a tropical rainforest; a bioluminescent bay; a natural underground cave system; and a tiny islet with breathtaking beaches.

Castillo de San Felipe del Morro

Address: 501 Calle Norzagaray, San Juan, 00901, Puerto Rico

Phone: +1 787-729-6960

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The Castillo de San Felipe del Morro, commonly known as El Morro, is Old San Juan’s most recognizable landmark. For over 400 years, it has protected San Juan and the shipping route from the New World to the Old. Today, a visit to this six-level citadel allows you to walk through a military history of Puerto Rico from the 1500s to the 20th Century. Explore cannons still facing the ocean, step inside a sentry box, and see how soldiers lived and worked in colonial times, including enhancements made by the U.S. during World War II.

The Vieques Biobay

Address: Bahía Bioluminiscente, 00765, Puerto Rico

Try visiting on a moonless night. When there is minimal light and you’re kayaking through mangrove trees out into Mosquito Bay on Vieques Island, you might begin to wonder what the fuss is about. Then you’ll notice your oars glowing green in the water, with fish streaking away like underwater lightning. You’ll soon understand why the Vieques Biobay is one of the most remarkable experiences Puerto Rico has to offer. Due to its geography and climate, as well as local conservation efforts, this bioluminescent bay is among the most dazzling in the world.

El Yunque

Address: El Yunque, Río Grande 00745, Puerto Rico

El Yunque, or “The Anvil,” is home to the only tropical rainforest in the U.S. National Forest System. Located a two-hour drive from San Juan, its lush, mountainous terrain is far removed from the city’s beaches and resorts. This is why visitors come here: to walk among the rainforest’s abundant flora, to hike along trails ranging from easy walks to difficult climbs, and to dive beneath waterfalls. This part of Puerto Rico remains unchanged in centuries, offering a glimpse into its stunning natural beauty.

Culebrita

Address: Culebrita, Fraile, Culebra, Puerto Rico

On the tiny Culebra Island, off Puerto Rico’s eastern coast, the star attraction is usually considered to be the impressive Flamenco Beach. However, many prefer Culebrita for its isolation (accessed via water taxi or private boat), its unspoiled beauty (the lighthouse here is the only manmade structure), and its stunning beaches. West Beach is a long stretch of sand hugging the coastline with vibrant shades of blue and excellent snorkeling opportunities. The Culebrita Reef is located on the south side of the island, while Playa Tortuga, a picture-perfect crescent of sand, is beloved by both nesting turtles and beachgoers alike.

Camuy Caves

Address: Carr. 129 K. 18.9, Quebrada, Camuy 00627, Puerto Rico

Phone: +1 787-898-3136

The Río Camuy Cave Park surpasses other attractions due to two significant reasons. First, visitors can combine it with a visit to the nearby Arecibo radio telescope, often included in package tours. Secondly, the Camuy cave system is the third largest in the world, allowing for some thrilling adventures. These guided tours take you through subterranean ravines, reveal caves over 600 feet deep, and explore an underground river. For the more active and daring, an eco-excursion is available, which includes rappelling, mud sliding, body rafting, and free-jumping through this phenomenal subterranean world.