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El Morro
Sitting high overlooking the entrance to San Juan Bay, El Morro is officially known as Fuerte San Felipe del Morro. One of the largest forts built by the Spaniards in the Caribbean, El Morro is the result of the efforts of many different Spanish engineers over a period of more than 200 years. The six-level fort has survived numerous attacks throughout its history.

Rio Camuy Cave Park
There are only two other places in the world where you will find a cave system as massive or dramatic as Rio Camuy Cave Park. Ride trams into the high Cueva Clara, lined with dense tropical vegetation or up to a platform overlooking the deep Tres Pueblos Sinkhole. Walk the 205 steps into the Spiral Sinkhole and Spiral Cave,where the sinkhole walls are covered with petroglyphs etched by the ancient Taínos. For the adventurous cave explorers, special tours and rappelling trips through undeveloped sections of the caves can be arranged.

Arecibo Observatory
The Arecibo Radio Telescope, the world's largest telescope and most well-known site in the region, is located in the middle of a lush rainforest in Arecibo. Visitors to the Radio Telescope can enjoy a small exhibit about the telescope, watch an educational film about the project, and visit the observation deck.

El Yunque
El Yunque is Puerto Rico’s most well known hiking experience, filled with cascading waterfalls and 26 varieties of animal species found nowhere else in the world. The only rain forest in the U.S. National Forest System and a United Nations World Biosphere Reserve, El Yunque is a must-see while in Puerto Rico. More than 100 billion gallons of annual rainfall account for lush plant life and an unusual tropical combination of sparkling leaves, glittery rocks and shadowy paths pierced by sunlight.

Guánica Dry Forest Reserve
Venture across 10,000 acres of dry land and come across over 600 species of rare plants and unique fauna including 48 endangered species and 16 that can only be seen in the reserve. The dry forest serves as a haven for hikers and bikers with twelve well-groomed trails ranging from easy to rugged. Guánica is very diverse, offering opportunities to swim, hike and bike within a few miles.

Vieques
Visitors travel to the relatively unexplored Island of Vieques for its fabulous pristine beaches, such as Sun Bay, Navío and Half Moon, and azure waters which are ideal for snorkeling and diving. One of the most fascinating attractions here is Mosquito Bay. Gorgeous by day and positively radiant by night, the bioluminescent organisms living in Mosquito Bay cause the water to glow at night when it’s splashed in the moonlight. Within the past few years, Vieques has experienced steady growth, and several trendy inns and restaurants have been developed near the shore.

Old San Juan
A United Nations world-heritage site, Old San Juan is filled with cobblestone streets dating back 500 years. Remarkable architecture is showcased in colorful and beautifully designed colonial churches, plazas, restaurants, hip boutiques and galleries. The most recognizable landmarks in San Juan are El Morro, and Fort San Cristóbal. These historical forts located on the Bay of San Juan protected Old San Juan from invaders during colonial times.

Culebra
The Culebra Natural Wildlife Refuge is an island off the eastern coast of Puerto Rico and is home to an abundance of bird-nesting colonies and other wildlife. The ideal location for amateur and professional naturalists concerned with preserving the ecosystem, Culebra is a favorite destination for its secluded and pristine beaches, including the famed Flamenco Beach.

Bioluminescent Bays
For a memorable experience, night swim in Puerto Rico’s Bioluminescent Bays home to large colonies of dinoflagellates that light up like fireflies and produce incredible glowing waters. Additional bays include the Northeastern region's Mosquito Bay in Vieques, La Parguera in the Porta del Sol region and Las Cabezas de San Juan in Croabas.

Rincon Bay
Located on westernmost tip of Puerto Rico in the Porta del Sol region, Rincón straddles the rough Atlantic and the gentle Caribbean Oceans. Offering six beaches, it was also the site of the World Surfing Championships in 1968, and since then has gained a reputation as the surfing capital of the Caribbean.