The 7 Best Boat Tours & Cruises in Agios Sostis
Agios Sostis is a fantastic starting point for exploring Zakynthos by sea. Unlike many other spots, this area offers easy access to some of the most scenic and wildlife-rich waters in the Ionian Sea. Whether you’re after a private boat experience or a guided tour to see turtles and caves, the options are numerous. We especially like the Zakynthos: Turtle Island and Caves Private Boat Trip for its personalized service and the chance to see Caretta Caretta turtles in their natural habitat. For a more budget-friendly but equally memorable experience, the Marathonisi Island Taxi Boat Trip by Eurosky offers a quick, affordable way to visit Turtle Island.
If you’re the kind of traveler who wants to be in control, renting your own boat at Agios Sostis is a solid choice. Or, if you prefer a comprehensive guided experience, the Guided Boat Tour to Turtle Island combines expert narration with ample time for swimming and snorkeling. No matter what style of adventure you’re after, Agios Sostis serves as a perfect launch pad for discovering Zakynthos’ stunning coastlines and marine life.
1. Zakynthos: Turtle Island and Caves Private Boat Trip
Set out from the peaceful waters right near Agios Sostis with this private boat trip. It’s a 3-hour journey that takes you through Keri Caves, around Marathonisi Island, and past the Mizithres rocks—a striking formation of twin islets. What makes this tour stand out is the personal touch you get with your own captain, Angelo, who is praised in reviews for his friendly demeanor and local knowledge.
The trip offers plenty of chances to spot Caretta Caretta turtles, snorkel in clear waters, and explore secluded caves. Highlights include stopping at Marathonisi Island, which resembles a turtle and is home to nesting sea turtles, and the chance to jump into tiny, hidden beaches. The boat is comfortable, and the itinerary is flexible enough to suit your interests. For those who want the most tailored experience and the chance to see turtles in the wild, this is hard to beat.
Bottom line: It’s a slightly pricier option but delivers an intimate, customized adventure perfect for couples or small groups seeking a memorable, wildlife-focused day.
2. Zakynthos: Guided Boat Tour to Turtle Island with Swimming
For around $316, the Guided Boat Tour to Turtle Island offers a well-rounded, guided experience ideal for travelers who want a mix of sightseeing and education. It departs from near Agios Sostis and lasts about 3 hours. Led by a knowledgeable local guide, this tour emphasizes marine conservation and offers a chance to see turtles in their natural environment—an experience many reviews describe as “magical.”
The itinerary includes stops at Keri Caves and Mizithres Rocks, with plenty of swimming and snorkeling opportunities. The guide shares insights about the local ecosystem and the importance of protecting the endangered Caretta Caretta turtles. Reviewers consistently mention how clear the waters are and how the guide’s expertise enriched the experience.
This tour is suitable for families or travelers interested in a guided, educational experience that combines wildlife watching with scenic beauty. The two-hour Marine Park visit is a highlight, giving ample time to observe the stunning landscape and marine life.
Bottom line: It’s an excellent option for those who want a guided, informative tour that balances wildlife viewing with spectacular scenery—especially if your time is limited.
3. Turtle Cruise from 9 am or 12 noon or 3 pm for 3 hours
If you’re on a tighter budget, this Turtle Cruise costs about $46 per person and offers a straightforward 3-hour experience departing from Zakynthos town. It’s a no-frills, group tour that guarantees turtle spotting in summer, plus stops at Keri Caves and Marathonisi for swimming and cave exploring. The tour also includes a stop at White Beach for a meal and relaxation.
While reviews are mixed—some note that the boat can be crowded—it’s a good choice for budget travelers or those who want a quick overview of the area without extra frills. The schedule is flexible, with multiple departure times, making it convenient to fit into your day.
This tour is best suited for travelers keen to see turtles and caves without spending too much or who don’t mind a busier boat. Be aware that the experience may lack the personalized attention of private trips.
Bottom line: It’s a practical, budget-friendly way to see Zakynthos’ marine highlights, with the trade-off of larger groups and less customization.
$46 per person
4. Agios Sostis Harbor: Rent Your Own Boat!
For travelers who prefer independence, renting a boat at Agios Sostis is hard to beat. With full insurance and Greek-authorized, well-equipped speedboats, you can set your own pace. For around $220 per group (up to five people), you gain the freedom to explore Turtle Island, Marathonisi, and the Keri Caves at your leisure.
This option is perfect if you want to skip guided tours and craft your own route, whether that’s lounging on a secluded beach or snorkeling in untouched waters. The reviews are glowing, especially praising the ease of renting and the stunning scenery they could access on their own schedule. You’ll need to be comfortable handling a boat or willing to take instructions from the rental company.
Key highlights include the ability to spot Caretta Caretta turtles in the Marine Park and explore caves and beaches that might be missed on group tours.
Bottom line: Rent your own boat if you’re comfortable navigating waters and want complete control over your day—perfect for a self-directed adventure.
$220 per group up to 5
5. Mykonos: Private 4×4 Jeep Island Adventure from Cruise Port
Though outside Zakynthos, this Mykonos island tour offers a different kind of boat-related experience—an off-road adventure exploring the island’s hidden corners. Lasting about 4 hours, it picks you up from the cruise port and takes you to remote beaches and quaint villages like Agios Sostis, Merchia, and Agrari.
Led by a local guide with a private 4×4, this tour is ideal if you want to see the authentic, quieter side of Mykonos away from the tourist crowds. It includes visits to Armenistis Lighthouse and scenic photo stops, giving you a well-rounded taste of the island’s landscapes.
While not a boat tour, it’s an excellent alternative for those who want a half-day tour that combines land exploration with scenic views, especially if interested in local culture and off-the-beaten-path spots.
Bottom line: It’s perfect for cruise passengers wanting a personalized, off-road experience, rather than a sea-focused tour.
6. Marathonisi Island Taxi Boat Trip by Eurosky
If your main goal is seeing Turtle Island without splurging, this taxi boat trip is a budget-friendly option at just about $22.58 per person. Over three hours, you’ll hop aboard a small boat from Agios Sostis Harbor, heading straight to Marathonisi for swimming, relaxing, and exploring.
Reviews highlight how relaxing the ride is, with plenty of time to swim in the crystal-clear waters or walk along the beaches. The tour also stops for photos of the Mizithres rocks and allows you to extend your stay on the island if you want to stay longer.
This trip is ideal for solo travelers or small groups who want a quick, affordable way to visit Turtle Island and enjoy some free time on the beach. Keep in mind that it’s less about guided commentary and more about leisure, so it’s better suited for independent-minded travelers.
Bottom line: An affordable, no-fuss way to visit Marathonisi, especially if you want to spend time on the island beyond the boat ride.
$22.58 per person
7. Zakynthos: Private Boat Tour with Captain
Our top choice for a customizable experience, this Private Boat Tour with Captain lasts between 3 and 5 hours. It’s perfect for those who want to tailor their journey—visiting caves, beaches, or wildlife spots like Caretta Caretta turtles—at their own pace.
The tour includes a visit to Marathonisi Island, Keri Caves, Mizithres rocks, and Agalas Caves. Many reviews praise the captain’s flexibility and local expertise, allowing you to skip crowded spots and focus on what interests you most.
This option suits travelers who value privacy and customization, with the ability to extend the trip or focus on specific sights. It’s more expensive but offers unmatched flexibility and comfort.
Bottom line: Ideal for those who want a private, flexible adventure, especially if you prefer avoiding large groups and enjoy a tailored itinerary.
How to Choose the Right Boat Tour in Agios Sostis
When selecting your boat experience, consider your budget, time constraints, and interests. Do you want a personalized, private trip? The Zakynthos: Turtle Island and Caves Private Boat Trip offers that perfect touch of exclusivity. Or, if you’re after an educational guide and marine conservation focus, the Guided Boat Tour to Turtle Island is a solid choice.
Budget travelers should look at the Marathonisi Island Taxi Boat Trip, which combines affordability with a relaxed vibe. Those seeking complete independence can rent their own boat from Agios Sostis, giving you total freedom to explore.
For cruise passengers, considering a land-based adventure like the Mykonos Private Jeep Tour might be appealing if you want a more comprehensive island experience.
Remember to book early, especially in peak season, to secure your preferred time slot and ensure availability.
Final Thoughts
Agios Sostis offers a wide variety of boat tours, from private, tailor-made trips to budget-friendly group adventures. Whether you’re eager to see turtles in their natural habitat, explore caves, or just relax on a boat, there’s something for every type of traveler. For those after a personalized experience, the private tours are unbeatable. Budget travelers should consider the ferry-style trips or renting a boat, which provide flexibility and affordability.
No matter which option you choose, booking early is wise to avoid missing out during the busy summer months. Pack your snorkeling gear, and don’t forget your camera—these waters are simply too beautiful to miss.