Monkey Island is officially known as Cayo Santiago. In fact, it’s a small island off the eastern coast of Puerto Rico, renowned for its population of free-ranging rhesus macaques. This unique destination is a fascinating spot for animal lovers and those interested in wildlife research. While the island itself is not open to the public due to ongoing scientific studies, there are several ways to view the monkeys and learn about the research conducted there. Next, we’ll help you plan your trip to see Monkey Island, Puerto Rico, and make the most of your visit.
Introduction to Monkey Island
Cayo Santiago, or Monkey Island, is a 38-acre island located about half a mile off the coast of Punta Santiago in Humacao. The island is home to around 1,000 rhesus macaques, descendants of monkeys originally brought from India in 1938 for scientific research. Today, the island serves as a research facility managed by the Caribbean Primate Research Center, affiliated with the University of Puerto Rico.
Getting to Monkey Island

By Car: To see Monkey Island, you’ll first need to get to the town of Punta Santiago in Humacao, Puerto Rico. If you’re driving from San Juan, the journey takes about an hour and a half via Route 30.
By Public Transport: Public transportation options are limited, but you can take a bus or taxi from San Juan to Humacao. From there, local taxis can take you to Punta Santiago.
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Ways to View Monkey Island

While you cannot set foot on Monkey Island, there are several ways to view the monkeys and learn about the research.
Boat Tours: Several companies offer boat tours that circle Monkey Island, providing an excellent opportunity to see the monkeys in their natural habitat. Indeed, these tours often include knowledgeable guides who can explain the history of the island and the ongoing research. Some popular boat tour operators include:
- East Island Excursions: Offers guided tours that provide a comprehensive look at Monkey Island and the surrounding waters.
- Pure Adventure: Known for their eco-friendly approach, Pure Adventure offers tours that focus on the ecological and biological aspects of the island.
Kayak Tours: For a more adventurous experience, consider taking a kayak tour. Kayaking around the island allows you to get closer to the shore and observe the monkeys more intimately. Kayak rental shops in the Punta Santiago area can set you up with the necessary equipment and guidance.
Stand-Up Paddleboarding: Another exciting way to view Monkey Island is by stand-up paddleboarding. This activity provides a unique vantage point and is suitable for all skill levels. Paddleboard rentals and guided tours are available in Humacao.
Drone Photography: If you’re into drone photography, capturing aerial views of Monkey Island can be a rewarding experience. Ensure you follow local regulations regarding drone usage and maintain a respectful distance from the wildlife.
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Best Time to Visit
Puerto Rico enjoys a tropical climate, making it a year-round destination. However, the best time to visit Monkey Island is during the dry season, from December to April, when the weather is more predictable and ideal for water activities.
Essential Items to Bring

When planning your trip to see Monkey Island, consider packing the following:
- Binoculars: To get a closer view of the monkeys without disturbing them.
- Camera: To capture your experience.
- Sun Protection: Sunscreen, sunglasses, and a hat to protect yourself from the tropical sun.
- Water and Snacks: Staying hydrated and nourished is essential, especially if you’re kayaking or paddleboarding.
- Swimwear and Towel: If you plan on engaging in water activities.
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Respecting Wildlife and Guidelines
It’s important to remember that Monkey Island is a research facility, and the monkeys are not pets but wild animals. Here are some guidelines to ensure a respectful and safe visit:
- Do Not Feed the Monkeys: Feeding the monkeys can disrupt their natural diet and behavior.
- Keep Your Distance: Observe the monkeys from a safe distance to avoid disturbing them.
- Follow the Rules: Adhere to any guidelines provided by your tour operator or guide.
Educational Resources and Research
If you’re interested in the scientific research conducted on Monkey Island, consider visiting the Caribbean Primate Research Center’s website or reaching out to the University of Puerto Rico for more information. Some boat tours also include educational components, providing insights into the research and the importance of the rhesus macaques in scientific studies.
Exploring Humacao

While in Humacao, take the time to explore other attractions:
- Humacao Nature Reserve: A beautiful reserve offering hiking, bird watching and kayaking opportunities.
- Punta Santiago Beach: A scenic beach perfect for relaxation and enjoying the local scenery.
- Palmas del Mar: A luxurious resort community with golf courses, restaurants and beautiful beaches.
Enjoy How to See Monkey Island
Visiting Monkey Island, Puerto Rico, offers a unique opportunity to observe rhesus macaques in a natural setting. Equally important, learn about important scientific research. While you cannot step foot on the island, boat tours, kayaking and other activities provide excellent vantage points to see the monkeys and appreciate their environment. Plan your trip, respect the wildlife, and enjoy the natural beauty and fascinating history of this special destination.















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