About Us
Want to know more about us?
SeaEO-Tours is a family business that grew to connect people with nature and share our love for marine wildlife.
Before booking a tour, it is essential to understand how we work.
Authentic Passion for the Ocean, Guided by Science
SeaEO‑Tours was born from a simple but powerful purpose: to connect people with the ocean in a way that is ethical, educational and deeply memorable.
As a family‑owned company, we believe that every encounter with marine wildlife can inspire awareness, respect and a renewed sense of responsibility for the natural world.
Our tours are led by a team of marine biologists, experienced skippers and ocean‑passionate professionals who combine scientific knowledge with genuine hospitality. With more than 6,000 hours at sea, we navigate with expertise, curiosity and a profound commitment to conservation.
Meet the best team
Get to know the people behind SeaEO-Tours.
CEO, Co-Founder and Skipper
Marine Biologist with a master’s degree in Biodiversity and Marine Conservation, Sidónio has been working in nature‑based nautical tourism since 2008. With over 20 years of sailing experience, STCW Basic Safety training and fluency in five languages, he combines scientific expertise with a passion for sharing the ocean’s stories. In 2018, he created SeaEO-Tours with his wife. As co‑founder, he ensures every guest feels safe, welcomed and inspired.
Co-Founder and Marketing Manager
With a background in Business Communication and a postgraduate degree in Business Management (Nova SBE), Carolina brings 17+ years of experience, including 8+ years developing digital marketing strategies, and has helped several brands make the leap online. She supports the team, shapes the brand’s voice and actively participates in the marketing community.
Rui Paviana
Skipper
Driven by a deep passion for ecology and conservation, Rui transitioned from a long career in the commercial sector to maritime tourism in 2018. With national and international nautical certifications, he ensures safe navigation and introduces guests to the extraordinary wildlife along the Lisbon coast.
Sales Manager and Skipper
After five years working on cruise ships, Bart traded the high seas for fast RIBs and returned to his hometown, Lisbon. Fluent in five languages and with a decade of customer service experience, he brings energy, knowledge and a love for marine wildlife. His underwater photography often appears on our social media.
Sara Grilo
Marine Biologist and Tour Guide
With a degree in Marine Biology and Ecology, Sara fell in love with cetaceans early in her studies. She guides guests with enthusiasm, explaining species behavior and ocean dynamics. For her, observing marine mammals is more than a job, it’s a daily source of curiosity, learning and purpose.
Maria Leal Diogo
Marine Biologist and Tour Guide
Maria holds a degree in Biology and a Master’s in Marine Biology and Conservation. Her master’s thesis focused on green turtles (Chelonia mydas) in West Africa. Since 2023, she has volunteered with the Tagus Dolphin Observatory, contributing to cetacean monitoring. For Maria, the sea is a daily opportunity to observe, learn, and inspire others to protect marine wildlife.
SeaEO-Tours in Numbers
The data presented covers the period from 2019 to 2025.
0 People transported
0 Hours at sea
0 Cetacean species observed
0 Marine biologist internships
Join us at sea
Book your experience with our team and discover the ocean through the eyes of those who want to protect it.
Dolphin Watching Boat Tour
Depart from Lisbon aboard a fast boat on the quest for Dolphins! A fantastic opportunity to observe these unique creatures in their natural habitat with a professional crew and a Marine Biologist.
Sunset Speed Boat Tour
Watch Lisbon transform under golden light as you glide along the Tagus. Enjoy a peaceful cruise past the city’s most iconic landmarks at sunset. A stunning and effortless way to end your day on the water.
Birdwatching Boat Tour
Pelagic Birds or Seabirds can be found in the Ocean. In this tour you’ll witness bird migrations and get closer to take amazing photographs. Perfect for Ornithologists, bird lovers and nature photographers.
Private Boat Rentals
Looking for a private tour? Need a boat transfer to Cascais? Do you want to take an exclusive tour for lunch by the river? We provide tailor-made services with an expert crew and in safe conditions.
We look for people passionate about the sea and marine wildlife.
Our crew is the most important and differentiating factor.
Send your CVHear from our customers
We are very proud of the service we provide. Read our testimonials from our happy customers. Discover what people say about us.