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Experience Zakynthos with this 3-hour glass-bottom boat tour from Laganas, exploring Keri Caves, Marathonisi Island, and spotting loggerhead turtles in their habitat.

This 3-hour tour from Laganas offers an exciting glimpse into the natural beauty of the National Marine park of Zakynthos. For $28.12 per person, travelers can explore Keri Caves, Marathonisi Island, and observe loggerhead turtles in their natural environment. The tour’s affordability and compact schedule make it a great choice for those seeking a quick yet immersive experience. The glass-bottom boat provides a fascinating view of underwater life without the need for snorkeling gear, though options to swim are available at select stops.
Participants can enjoy shaded seats or a sun deck onboard, giving flexibility to relax or soak up the sun. Highlighted by glowing limestone at the caves and lush greenery on Marathonisi, this tour balances scenic sightseeing with wildlife spotting. While swimming inside the caves isn’t permitted, the stops at Oasi Bay and Keri Caves allow for refreshing dips. Suitable for travelers wanting a concise, memorable adventure, this tour combines natural scenery with the chance to see sea turtles in their protected habitat.
You can check availability for your dates here:
Planning more time in Agios Sostis? We've covered other experiences worth considering.

This tour begins at the Agios Sostis harbor in Laganas, where you’ll find the Nautilos Flag marking the boat. The operator, YOTOMU, offers free cancellation up to 24 hours in advance, providing peace of mind in case plans change. You can reserve now and pay later, allowing flexible planning.

The boat features both shaded seating and a rear sundeck, giving options to relax in the shade or work on your tan. The smooth ride across protected waters of the marine park emphasizes comfort, while the glass-bottom enhances the experience with views of underwater scenery. This setup is ideal for travelers who prefer to enjoy the ride with minimal fuss.

A highlight of the tour is the stop at Keri Caves, only accessible by boat, where you can swim in the blue-lit waters and marvel at limestone formations. The caves are a favorite for their dramatic scenery, though swimming inside the caves themselves isn’t allowed. The swim stop at Oasi Bay, located near the caves, offers a chance to cool off in calm, clear waters and take photos of the natural limestone and greenery.
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The small island of Marathonisi, often called Turtle Island, is known as a breeding ground for loggerhead sea turtles. The tour allows free time on the island for exploring or relaxing at a bar, where snacks, drinks, and ice cream are available for purchase. The beach on Marathonisi is protected, with only a small accessible portion, since it’s a designated turtle nesting site. Visitors can enjoy the lush pine, olive, and oak forests surrounding the island.

While swimming inside the caves isn’t permitted, the swim stops in Oasi Bay and Keri Cave’s area provide opportunities to enjoy deep blue waters. The shallow waters near Marathonisi’s beach also offer a good spot for snorkeling. Travelers should bring snorkeling gear, towels, and sun protection to maximize their comfort during these stops.

This tour is particularly praised for the chance to see loggerhead turtles in their natural habitat, a rare experience that highlights Zakynthos’s ecological importance. It’s worth noting that turtle conservation efforts mean the beach on Marathonisi is mostly inaccessible to visitors, as it’s a protected breeding ground. The tour emphasizes wildlife observation without disturbance, making it a responsible choice for nature lovers.

Travelers should bring sunglasses, sun hats, swimwear, towels, sunscreen, and snacks. Since food and drinks are only available for purchase on Marathonisi, packing some snacks may be wise. Luggage and large bags are not allowed onboard, to keep the boat free for guests. The tour is conducted in Greek and English, and the boat crew is known for being friendly and accommodating.
This budget-friendly tour suits those interested in wildlife spotting, scenic views, and short boat trips. It’s perfect for travelers who enjoy nature, photography, and relaxing in calm waters. Families, couples, and solo explorers can all appreciate the blend of adventure and leisure, though those seeking extensive swimming inside caves or long beach stays might prefer longer or different tours.
This tour combines scenic boat rides, wildlife encounters, and stunning coastal scenery in a compact 3-hour package. The glass-bottom boat offers unique underwater views, while the stops at Keri Caves and Marathonisi provide both adventure and relaxation. The opportunity to observe loggerhead turtles in their natural environment is a significant highlight, embraced by visitors and praised for its authenticity.
While swimming inside the caves isn’t allowed, the swim stops at Oasi Bay and the shallow waters near Marathonisi are enjoyable and safe. The affordable price and flexible booking options make this a convenient choice for many travelers. This tour is especially suited for those who value ecological respect, scenic beauty, and brief but satisfying experiences on Zakynthos.
“To see turtles in their natural habitat was incredible. Dramatic scenery and the sea was delightful.”
Is hotel pickup included? No, the tour meeting point is at the Agios Sostis harbor.
What is the price of this tour? It costs approximately $28.12 per person.
How long does the tour last? The activity runs for about 3 hours.
Can I swim during the tour? Yes, you can swim at Keri Caves and Oasi Bay, but swimming inside the caves is not permitted.
Is there a chance to see turtles? Yes, the tour offers a good chance to spot loggerhead turtles in their habitat.
What should I bring? Pack sunglasses, sun hat, swimwear, towel, sunscreen, and snorkeling gear.
Is the tour suitable for children? The description suggests it’s suitable for most ages, especially those comfortable with boat rides.
Can I cancel this tour? Yes, full refund is available if canceled up to 24 hours in advance.
Are food and drinks included? No, but they are available for purchase on Marathonisi.
Is the tour wheelchair accessible? The information does not specify accessibility features, so check with the provider in advance.
This well-organized, wildlife-focused boat trip from Laganas offers a balanced mix of scenic beauty, wildlife encounters, and relaxing stops, making it a worthwhile addition to any Zakynthos itinerary.
You can check availability for your dates here: