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Discover Sesimbra’s stunning coastline from a transparent boat, enjoy marine life views, swimming stops, and an eco-friendly adventure in Portugal.
Imagine gliding over crystal-clear waters, with the underwater world unfolding beneath your feet in a way you’ve never experienced before. That’s exactly what the Sesimbra: Clear Boat Experience promises—a unique, transparent boat tour that offers a fresh perspective on Portugal’s scenic coastline. Departing from Sesimbra’s lively harbour, this journey combines stunning vistas, marine life encounters, and intimate group settings, making it a standout choice for anyone seeking a memorable adventure.
What really makes this tour special? We’re fans of the fully transparent boat design that allows you to observe marine life without getting wet or diving in. It’s a perfect blend of relaxation and discovery. On the flip side, some might find the activity less suitable if they’re prone to seasickness or prefer larger, more bustling boat trips. But for those looking for a peaceful, eco-conscious experience with plenty of photo-worthy moments, this tour hits the mark.
This experience is particularly well-suited for travelers who love nature, crave authentic views, or want a different way to explore Portugal’s famed coastlines. Whether you’re a solo traveler, a couple, or a small group, the intimacy of the small-group setting adds a personal touch.


More ways to experience Sesimbra from the water include these boat tours
Starting at the lively harbour of Sesimbra, the tour is designed for those who want more than just a boat ride. You’ll board a fully transparent boat—a first in Portugal—that transforms the typical coast excursion into an immersive adventure. We loved how this design emphasizes connection with nature while maintaining comfort and safety.
The tour duration, around 1.5 to 2 hours, feels just right—long enough to soak in the scenery and enjoy several stops, but not so lengthy that it becomes tiring. Plus, the availability of multiple start times helps fit into different travel plans, whether you’re a morning person or prefer a late afternoon experience.
A quick safety briefing kicks things off, which is helpful for first-timers or those unfamiliar with boat tours. The boat’s design, made from a clear, durable material, is as impressive as it sounds, allowing unobstructed views of the water below. Passengers are asked to remove their shoes before boarding, which helps keep the surface pristine.
This tour doesn’t include food or drinks, so bringing your own snacks, water, and sunscreen is smart. Also, it’s worth noting that the boat isn’t suitable for very young children under 3, pregnant women, or individuals with mobility issues. Seasickness tablets are recommended for those sensitive to motion.
Stop 1: Sesimbra Harbour
Here, you’ll gather for a brief introduction and safety talk, setting the tone for the adventure ahead.
Stop 2: Scenic Scenic & Glass-Bottom Ride
Sailing past beautiful coastlines, you’ll get to admire the landscape from the water, with a 20-minute glass-bottom segment where marine life and seabeds are visible through the transparent hull. Reviewers mention that the views are awe-inspiring, especially when seeing fish and underwater formations up close.
Stop 3: Praia do Ouro
A highlight for many, this lovely beach is perfect for a swim in the clear waters. The tour provides time for a dip, which guests say is “refreshingly relaxing” and offers a good chance to cool off after taking in the views.
Stop 4: Praia do Ribeiro do Cavalo
Another exclusive gem, this beach is a photo hotspot and a popular swimming spot. The calm, transparent waters make it ideal for a leisurely swim or simply lounging with a camera in hand.
Stop 5: Secret Scenic Stop
A lesser-known spot, this stop is perfect for taking photos and soaking in the surroundings. Reviewers note that the scenery here is peaceful and unspoiled, giving the feeling of discovering a private paradise.
Return to Sesimbra
The journey wraps up with a gentle sail back, leaving you with plenty of content for your camera and memories.
Multiple reviews highlight the opportunity to observe marine life without diving. Passengers have reported seeing schools of fish, octopuses, and various seabed formations through the clear hull. The boat’s design promotes an intimate connection with the underwater environment, making it ideal for nature lovers and photography enthusiasts alike.
At around 1.5 to 2 hours, the tour offers a balanced experience—not too short, not too long. The cost includes the coastal cruise, swim opportunities, marine life observation, and a small group setting. The small-group format means fewer crowds and more personalized attention, which many travelers value. Considering the novelty of the transparent boat and the quality of the scenery, the price reflects good value, especially compared to larger, more commercial tours.
The tour emphasizes environmental respect, with guidance to avoid touching marine life, plants, and littering. The boat’s unobtrusive design helps it blend into the landscape without disturbing the natural surroundings. For eco-conscious travelers, this aspect adds an extra layer of appeal.
Practical tips? Bring a hat, waterproof camera, sunscreen, and water. If seasickness is a concern, taking medication beforehand is wise. Also, try to arrive 10 minutes early to avoid feeling rushed.
This experience is best suited for travelers seeking a peaceful, scenic cruise with a twist—literally. If you love stunning views, wildlife, and photography, you’ll find plenty to enjoy here. It’s perfect for couples, small groups, or solo adventurers eager to escape the crowded beaches.
It might not be ideal for children under 3, pregnant women, or those with mobility issues, given safety and accessibility considerations. Also, if you’re looking for a high-energy water sport or longer adventure, this gentle cruise may feel too relaxed.

The Sesimbra: Clear Boat Experience offers a genuinely different way to appreciate Portugal’s coast, combining innovative design, stunning scenery, and marine encounters. It’s a fantastic option for those who want a peaceful, intimate glimpse beneath the water’s surface without getting wet or diving in. The small-group setting makes it especially appealing for travelers seeking personalized attention and a connection to nature.
For anyone craving gorgeous views, marine wildlife, and a break from busy tourist spots, this tour provides a well-rounded, eco-conscious adventure that feels both exclusive and authentic. Its focus on environmental respect and the thrill of seeing underwater life through a transparent hull make it stand out in the sea of typical boat trips.
Overall, if the idea of sailing over clear waters, snapping photos of seabed life, and chilling on a boat with just a handful of others appeals to you, this experience is a smart choice. It’s a memorable, scenic journey that can become a highlight of your Portugal trip—offering a different perspective that’s hard to forget.

This transparent boat adventure in Sesimbra provides a beautiful, eco-friendly way to explore Portugal’s coastline, perfect for those who want to experience the sea’s wonders comfortably and authentically.