Exploring Zakynthos with a boat tour to the Keri Caves and Turtle Island offers a chance to see some of Greece’s most captivating natural sights from a close-up perspective. This three-hour journey, led by an experienced captain like Dimitris, takes you through hidden caves, crystal-clear waters, and the habitat of Caretta Caretta sea turtles. It’s a balanced mix of adventure, relaxation, and wildlife spotting that delivers authentic moments away from overly touristy spots.
What I love about this tour are how intimate and flexible it feels — with a small group limited to seven participants, you get to enjoy personal attention and better access to caves that larger boats simply can’t reach. Plus, the chance to swim in the Keri Caves’ bright blue waters and to see the turtles in their natural environment feels genuinely special. On the flip side, the tour lasts only three hours, so if you’re eager to explore more, this may feel a bit brief. It’s also worth noting that it’s not suitable for those prone to seasickness or with back problems, which might put a damper on some travelers’ plans.
This experience excels at showcasing Zakynthos’s marine beauty with a well-organized, friendly vibe. The opportunity to snorkel, photograph caves, and relax on Turtle Island’s sands makes it a standout for anyone wanting an authentic, nature-focused outing. It’s especially ideal for travelers who appreciate small-group tours, wildlife viewing, and the magic of Greece’s coastal caves.
Key Points / Takeaways

- Small-group intimacy ensures personalized service and access to caves larger boats avoid.
- Wildlife spotting includes the chance to see Caretta Caretta turtles in their natural environment.
- Exploring Keri Caves reveals stunning caves with sunlight reflections and tunnels you can swim through.
- Turtle Island (Marathonisi) is shaped like a mother turtle, offering scenic beauty and relaxing beaches.
- Flexibility with morning or afternoon tours helps fit this experience into your schedule.
- Snorkeling gear is included, so you can get close to marine life and underwater caves.
Discovering Zakynthos’s Marine Treasures

When you think of Zakynthos, images of lively beaches and bustling towns might come to mind. But if you’re willing to venture a little off the beaten path, the Keri Caves and Turtle Island boat tour offers a fascinating glimpse into Greece’s coastal wilderness. This is a trip that combines the thrill of discovery with the serenity of swimming in clear waters, all led by a knowledgeable captain like Dimitris who knows these waters well.
This tour typically lasts about three hours, making it an ideal half-day activity that can slot into your vacation without overwhelming your schedule. You’ll meet at Agios Sostis Port — a scenic spot near Cameo Island — where a small boat awaits. The intimacy of small boats, capped at seven people, means you’re not just another face in a crowd, and the captain can tailor the experience a bit depending on the weather and your interests.
Ready to set sail again? More boat adventures we've reviewed in Keri
Why This Tour Stands Out
What truly makes this experience memorable is the chance to see Caretta Caretta sea turtles in their natural habitat. These gentle creatures are rare to spot in the wild, but with patience, you might find yourself watching them glide through the water, completely at ease. I appreciated how the guide emphasized respecting the animals, and you’ll be encouraged not to touch the turtles or marine life — a small but significant detail for eco-minded travelers.
Another highlight is exploring the Keri Caves, which are not only stunning to behold but also accessible because of the small boat. Larger vessels often can’t navigate into these caves, so your boat gets you closer to the limestone formations and sunlight reflections that make these caves so photogenic. For those feeling adventurous, swimming through a narrow connecting tunnel between caves is an option, adding an extra dash of excitement.
What to Expect at Each Stop
The tour kicks off at Cameo Island, a charming spot with a small pier and scenic views, setting a picturesque tone for the day. From there, you head toward Marathonisi, or Turtle Island. Shaped like a mother turtle, this island is a nesting site for sea turtles, and the beaches here are quiet and inviting. You’ll stop for about 35 minutes to swim and relax, often with the chance to grab a cold drink from a floating bar — a nice touch that adds comfort without losing the rustic charm.
Next, the boat moves toward the Keri Caves, stopping for another 35-minute swim, snorkel, and explore period. The caves are a photographer’s dream, with sunlight bouncing off the water and illuminating the limestone formations. Inside, you can even swim through a small tunnel if you’re feeling brave. The guide will point out natural springs and caves, making it more than just a swim: it’s a mini adventure in geology and marine beauty.
Finally, the boat cruises through the Zakynthos Marine Park, where marine life viewing is possible. Expect to see the natural habitat of various fish and seabirds, adding a layer of ecological interest to the trip. After this, you return to Cameo Island, with plenty of photos and stories to share.
The Practicalities: What’s Included and What Not
This tour offers good value for those interested in a personalized, active experience. The cost covers the boat, fuel, snorkeling equipment, and the expertise of your captain, Dimitris, who reviews the waters with an eye for safety and wildlife. You’ll also receive plenty of photo opportunities — an important perk for capturing memories of these unique landscapes.
Extras like hotel pickup, meals, or personal expenses are not included, so plan ahead if you want snacks or drinks. The meeting point is straightforward — Agios Sostis Beach in front of the villa with big palm trees, or Zantediving Center. It’s a walkable location, but it’s worth arriving a few minutes early to settle in and get your gear ready.
Timing and Group Size
You can choose between a morning or afternoon tour, depending on your preference for light and weather conditions. Keep in mind that seasickness or back problems could affect your comfort; the small boat, while nimble, can be a little bumpy on choppy days. The limited group size ensures a more relaxed vibe, and the guide, Dimitris, is known for his friendly attitude and local knowledge.
Who Should Consider This Tour?

This experience is perfect for travelers who enjoy being close to nature and wildlife, small-group settings, and exploring Greece’s lesser-known coastal gems. Families with older children, couples, or solo travelers wanting a memorable, active outing will find it suits them well. If you’re a photographer or someone who loves capturing stunning scenery and marine life, this boat tour offers ample opportunities.
However, if you’re prone to seasickness or prefer a more leisurely, land-based activity, you might want to consider other options. It’s also worth noting that the tour isn’t suitable for those with back problems due to the boat’s movement.
The Sum Up

This Zakynthos boat tour to the Keri Caves and Turtle Island strikes a smart balance between adventure and relaxation. You’ll enjoy the thrill of exploring caves inaccessible to larger boats, the serenity of swimming in pristine waters, and the chance to see Caretta Caretta turtles in their natural environment. The small-group format and knowledgeable guides, like Dimitris, ensure an experience that feels personal and authentic.
It’s a fantastic way to spend a few hours if you value nature, wildlife, and stunning scenery on your Greek holiday. The combination of beautiful caves, wildlife encounters, and scenic beaches makes this a worthwhile addition to your Zakynthos itinerary — especially if you’re eager to see the island’s marine treasures without the crowds.
FAQ

Is this tour suitable for children?
While the tour may be enjoyable for older children comfortable on boats, it’s best suited for those who can handle swimming and a bit of boat movement. Shorter trips and small groups make it more manageable for families.
What should I bring?
Bring a hat, swimwear, a towel, camera, snacks, sunscreen, and water. The boat provides snorkeling gear, but packing your own extra hat or sun protection is wise.
Can I see turtles on every tour?
While the guide will do their best to spot turtles, wildlife sightings depend on the day’s conditions. Watching for them in their natural habitat is a matter of patience.
Is there a bathroom on the boat?
The tour description doesn’t specify a bathroom on board, so plan accordingly before departure.
How long are the stops?
Each swimming stop at Marathonisi and Keri Caves lasts about 35 minutes, giving enough time to swim, snorkel, and relax.
Can I swim through the caves?
Yes, if you’re comfortable, you can swim through a small tunnel connecting some caves, which is a fun highlight for adventurous swimmers.
Is this tour weather-dependent?
Yes, choppy seas or bad weather could affect the trip. Always check the forecast and confirm the tour before heading out.
What makes this experience unique?
The chance to see Caretta Caretta turtles in the wild and explore caves that larger vessels can’t access makes this a special, intimate encounter with Zakynthos’s natural beauty.
More Boat Tours & Cruises in Keri
More Tours in Keri
More Tour Reviews in Keri
- Zakynthos Private Sunset Boat: Keri Caves & Mizithres (max5)
- Zante Private Boat: Marathonisi, Keri Caves, Mizitres (max5)
- Zakynthos: Romantic Sunset Tour & the Legend of the Dragon
- Zakynthos: Private Cruise to Shipwreck Beach
- Zante Private Boat: Keri Caves, Mizithres, Eros Cave (max5)
- Zakynthos: VIP Cruise around the island by the Royal Yachts
Not for you? Here's more things to do in Keri we have recnetly reviewed
- Unique Cruise to Shipwreck beach and local blue caves
- Zakynthos : island half circle boat tour
- Zakynthos: Boat Rental
- Laganas:Turtles, Marathonisi, Keri caves with speedboat
- Glass boat cruises to spot turtles
- Zakynthos: 3 Hours RIB tour to Mizithres Rocks & Keri Caves
- Zakynthos: Turtle Island, Keri Caves, & Sunset Boat Tour
- Zakynthos: Private Half-Day Trip Along the Southern Coast
- Zakynthos: Sunset Private Cruise to Myzithres
- Zakynthos Main Port: Full-Day Cruise by Unique Pirate Ship
- Zakynthos: Private Boat Tour South Coast & Swim Stops
- Zakynthos: 24ft Cranchi Private Cruise for 5 People
