Arecibo Observatory at dusk.

Arecibo Observatory, one of the largest and most sensitive single-dish telescopes on the planet.

Things to Do in Arecibo

Limestone caves, unspoiled beaches, and otherworldly attractions.

Just one hour west of San Juan, coastal Arecibo is home to some of the best off-the-beaten-path adventures on the island. With its dramatic karst landscape — defined by limestone formations, extensive cave systems, and subterranean rivers — plus attractions like the Arecibo Observatory, the trip to Arecibo is a bit like entering another world. There, you can explore caves, walk in the footsteps of pirates, or just plant yourself on some of the prettiest beaches in Puerto Rico.

Take a look at the top things to do in Arecibo:

Arecibo Observatory

Built into a giant limestone sinkhole within the northern karst region, the Arecibo Observatory houses the largest fully operational single-dish radio telescope on the planet. Amazing discoveries have been made with this telescope, such as the first binary pulsar, and several movies have been filmed here, including "Contact" (1997) and "GoldenEye" (1995). With interactive exhibits to help explain the observatory’s role in the scientific community, a visit there is out of this world.

A hiker stands at the mouth of Cueva Ventana.

A hiker stands in Cueva Ventana overlooking the lush valley below.

Cueva Ventana

One of the most visited sites in Arecibo — and one of the most breathtaking views in Puerto Rico — can be found at Cueva Ventana, a window-shaped cave which overlooks a panorama of cliffs and valleys so pretty it could be a living painting. Inside, there are distinctive petroglyphs preserved from the Taínos, the island’s pre-Columbus inhabitants. Sign up for a guided hiking tour to learn all about northern Puerto Rico’s cave system, its history, and its stunning flora and fauna.

Ocean view of the Punta Los Murillos Lighthouse in Arecibo.

The Punta Los Morrillos Lighthouse in Arecibo houses a cultural theme park. 

Arecibo Lighthouse and Historical Park

This neoclassical lighthouse was built by the Spanish government in 1898, and now houses a cultural theme park that will transport you to the buccaneer days when pirates roamed the northern shore of Puerto Rico.

On your way to the lighthouse, you will find replicas of the three ships the Spanish used to conquer the New World; a re-created Taíno village; and a pirate ship that kids can climb and explore. The park also has a museum, an aquarium, and a mini-water park that’s a serious hit with kids. With food vendors on-site, you can easily make an entire family day out of this visit.

 A surfer walks along the stunning cliffs of Cueva Del Indio in Arecibo.

Cueva Del Indio (Indian Cave) offers postcard-perfect vistas. 

Cueva del Indio

Jutting over the turquoise sea and forming a stunning natural bridge, Cueva del Indio (Indian Cave) offers many postcard-perfect vistas for a stunning photo op. Soak in the view of sea cliffs, arches, and karst rocks that have been formed into natural sculptures by ocean waves over the years. The cave also contains the largest number of Taíno petroglyphs on the north coast.

Casa Ulanga is the Cultural Center of Arecibo.

Casa Ulanga is the Cultural Center of Arecibo.

Casa Ulanga

If the walls of this circa-1854 colonial building could talk, they’d tell the many colorful tales of Arecibo’s history. Casa Ulanga was originally the residence of a high-ranking Spanish conquistadorc the building has served as a bank, store, city hall, hospital, courthouse, and jail. It’s now the Cultural Center of Arecibo, which hosts various festivals and activities throughout the year.

Which way to go? Cambalache State Forest has 1,600 acres to explore.

Cambalache State Forest

See a variety of vivid birds and native flora at this 1,600-acre forest, which extends from Arecibo to Barceloneta. The many hiking and biking trails at Cambalache State Forest make for great day trip; or, reserve a campsite — complete with amenities like barbecue grills and gazebos — and stay a bit longer.

Sunny day at Lago Dos Bocas, surrounded by mountains and vegetation.

Lago Dos Bocas - located between Utuado and Arecibo - is an ideal lake for boating. 

Lago Dos Bocas

Nestled between Arecibo and Utuado is one of the principal lakes of Puerto Rico. Bring your own watercraft or board the state-operated boat for a relaxing ride. The waters of Lago Dos Bocas are thronged by mountain peaks and tropical foliage, plus a variety of restaurants and local businesses with their own boats to transport you to and from the pier.

Poza del Obispo beach in Arecibo.

Poza del Obispo (Bishop's Pool) is one of the most unique beaches in Puerto Rico.

Poza del Obispo

This off-the-beaten path beach is one of Arecibo’s hidden treasures. Two limestone outcroppings form a natural pool that’s protected from the waves, with inviting turquoise water and soft golden sand. Because it is generally so calm, Poza del Obispo is a great place for families with children.

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