Sesimbra, Portugal, offers some of the best snorkeling experiences along the Atlantic coast. Its clear waters, unspoiled beaches, and hidden caves make it a prime spot for underwater exploration. Many visitors rave about the boat tours that pass through the Arrábida Natural Park, giving access to secluded beaches like Ribeiro do Cavalo and Mijona Beach. If you’re after a relaxing, scenic day with opportunities to swim and spot marine life, Sesimbra’s tours won’t disappoint. Especially popular are the boat trips that include stops at secret beaches, where the tranquility and beauty are unmatched—perfect for both novice snorkelers and seasoned explorers. For a more active adventure, the kayaking and snorkeling combo at Arrábida offers an intimate way to see the park’s biological wonders.
If you’re not sure which tour fits your style, don’t worry. Below, we cover six of the best snorkeling experiences in Sesimbra, highlighting what makes each unique, so you can choose the one that suits your mood and budget.
1. Sesimbra: Arrábida Beaches & Caves Boat Tour with Snorkeling
This boat tour takes you through the Arrábida Natural Park, a protected area known for its crystal-clear waters and dramatic coastline. Over three hours, you’ll visit several hidden beaches including Praia do Inferno, Mijona Beach, and the remote Praia do Ribeiro do Cavalo. The tour offers plenty of chances to swim, snorkel, and explore sea caves, which makes it ideal for those who want to combine sightseeing with underwater adventures.
What makes this tour stand out is its well-curated itinerary, including a regional drink enjoyed at a scenic beach view and a guided tour of stunning photo stops. The guides are knowledgeable and passionate, often sharing insights about the area’s geology and marine life. Reviews consistently praise the experience, with one traveler mentioning, “The opportunity to swim in crystal waters and explore caves was unforgettable.” The tour is priced at $57, offering excellent value considering the scenery and activities included.
Bottom Line: If you love a mix of scenic cruising, secluded beaches, and snorkeling, this tour offers a comprehensive, well-reviewed option at a reasonable price.
2. Sesimbra: Secret Bays and Beaches Boat Tour with Snorkeling
For those seeking an authentic, local flavor, the Secret Bays and Beaches Boat Tour is perfect. It’s a shorter, 2.5-hour trip that focuses on lesser-known spots, many favored by locals. Here, you can snorkel in calm, clear waters and enjoy unspoiled beaches like Ribeiro do Cavalo. The tour’s intimate size and focus on eco-friendly practices make it stand out for travelers who want a relaxed and environmentally conscious experience.
What’s special about this tour is the emphasis on connecting with nature—small groups mean more personalized attention, and the guides are keen to share insights about the marine ecosystem. Reviewers love the “tranquility of the beaches and the friendly, knowledgeable guides,” highlighting how this trip feels like a local secret shared just with you. At $57, it offers great value, especially for those wanting a shorter but deeply immersive experience.
Bottom Line: Best suited for travelers who appreciate quiet, scenic spots and want a more intimate snorkeling outing with a local touch.
3. Arrábida: Kayaking and Snorkeling Experience
If you prefer an active day outdoors, the Kayaking and Snorkeling Experience at Arrábida is ideal. Over two hours, you’ll paddle along narrow beaches and rock formations, then jump into the water to snorkel among colorful fish and sea urchins. This tour is perfect for those who want to combine physical activity with underwater exploration in a scenic setting.
Guides are experienced, making safety and fun a priority. The route takes you through secret caves along the Serra da Arrábida, offering a different perspective than boat trips. Reviewers often mention how peaceful and beautiful the kayaking route is, with one noting, “Like swimming in an aquarium, but way better.” The tour’s price is competitive, and it suits active travelers looking for a more hands-on adventure.
Bottom Line: Best suited if you enjoy paddling and want a more personal, nature-focused experience with snorkeling in quiet coves.
4. Sesimbra: Boat Trip with Snorkeling at Secret Beaches and Bays
This boat trip offers a full three-hour journey to explore quiet bays and caves, including the striking Cabo Espichel. It’s a great choice for those who want to relax and enjoy multiple snorkeling stops, such as Ribeiro do Cavalo and Inferno Beach, with ample time to swim and observe marine life in clear waters.
What makes this tour appealing is the variety of activities, including stand-up paddleboarding and wine tasting, making it a well-rounded day. The boat is comfortable, and the guide’s local knowledge offers insights about the region’s geology and history. One review highlights the “breathtaking scenery combined with snorkeling and relaxing on secluded beaches.” At $59, it’s slightly more than some others but offers a comprehensive experience.
Bottom Line: Perfect if you want a longer, varied day that combines snorkeling with other water activities and scenic stops.
5. Sesimbra: Snorkeling Tour through Wild Beaches and Caves
If your priority is a small-group, eco-friendly adventure, this Snorkeling Tour offers a relaxed, leisure-paced exploration of Sesimbra’s coastline. It lasts about 2.5 hours, focusing on marine wildlife viewing and snorkeling at remote beaches like Ribeiro do Cavalo and Mijona.
What sets this tour apart is its emphasis on responsible tourism—using environmentally sustainable practices and guiding visitors through more secluded spots. Reviewers appreciate the “personalized service and the chance to see marine life in untouched waters,” making it suitable for eco-conscious travelers and families. The price is $59, and it’s ideal for those wanting a slow-paced, intimate experience with nature.
Bottom Line: Best for small groups and eco-minded travelers who want a leisurely, wildlife-focused snorkeling experience.
6. Sesimbra: Boat trip along beaches and bays with snorkeling
The most straightforward choice, this boat trip costs $57 and lasts about 2.5 hours. It’s designed for travelers who want a quick, scenic cruise with some snorkeling at Ribeiro do Cavalo and other untouched beaches. The focus is on creating memorable moments with stunning views and marine life in clear waters.
The trip’s simplicity makes it accessible, with a friendly atmosphere and good stories shared by the crew. A reviewer called it a “great trip with nice stories about the area,” emphasizing the relaxing vibe. This is a solid choice if you’re short on time but still want a taste of Sesimbra’s underwater beauty.
Bottom Line: Ideal for travelers seeking a short, scenic snorkeling adventure without extra frills.
$57 per person
How to Choose the Right Snorkeling Tour in Sesimbra
When selecting your ideal tour, consider your budget, fitness level, and interests. For a comprehensive day with cave exploring and multiple beaches, the Arrábida Beaches & Caves Boat Tour offers excellent value. If you prefer a quiet, eco-conscious trip, the Secret Bays and Beaches Boat Tour might be your best fit. For more active travelers, the kayaking option provides a close-up view of Arrábida’s natural beauty.
Timing also matters—most tours run seasonally from spring through early fall when the waters are warmest. Booking early is recommended, especially for popular tours with high ratings like these.
Final Thoughts
Sesimbra’s range of snorkeling experiences guarantees something for every traveler. Whether you prefer a relaxed boat cruise with plenty of time to swim and relax, or an energetic kayak adventure exploring caves and coves, the options are plentiful. For those who value in-depth exploration of protected marine areas, the Arrábida Beaches & Caves Boat Tour ranks high with its knowledgeable guides and stunning scenery. If you want a more intimate, eco-friendly experience, the small-group tours will suit you perfectly.
No matter which tour you choose, booking in advance will ensure you secure a spot on these popular trips. With such a variety of options, your underwater adventure in Sesimbra is sure to be memorable.