Book a Zakynthos Marathonisi Island Swim Keri Caves and Turtle Spotting Tour

Overview

Experience the natural beauty of Zakynthos on this half-day boat tour combining Marathonisi (Turtle Island), the Keri Caves, and turtle-spotting opportunities in the National Marine Park. This guided cruise takes you through calm southern waters where guests can swim in crystal-clear bays, explore sea caves by boat, and look for the island’s famous Caretta Caretta sea turtles in their natural habitat. The experience is designed as a relaxed coastal excursion focused on swimming, sightseeing, and wildlife observation.

Experience highlights

• Half-day boat tour of Zakynthos’ southern marine park

• Visit Marathonisi (Turtle Island) with swimming stop

• Explore the Keri Caves by boat

• Opportunity to spot Caretta Caretta sea turtles

• Swimming in clear Ionian Sea waters

• Scenic coastal cruising along Laganas Bay

• Guided boat experience with local skipper

• Photo opportunities of caves, cliffs, and beaches

• Small-group marine excursion

What’s included

• Boat cruise through Zakynthos National Marine Park

• Professional skipper or local guide

• Swimming stops at Marathonisi and designated bays

• Safety equipment onboard

• Basic onboard assistance during the trip

• Hotel pickup and drop-off from selected areas (where applicable)

What’s not included

• Food and drinks

• Personal expenses

• Optional gratuities

• Any additional services not specified in the tour description

Itinerary

The tour begins with pickup from selected locations around Zakynthos or direct meeting at the departure point, depending on booking arrangements. Guests board a boat and set out into Laganas Bay, a protected marine area known for its calm waters and frequent sea turtle activity.

The cruise first heads toward Marathonisi (Turtle Island), where guests typically have time to swim, relax on the beach, or explore the shallow turquoise waters surrounding the island. The area is also known as a nesting site for Caretta Caretta turtles, and sightings may occur in the surrounding sea.

The journey continues along the coastline toward the Keri Caves, where the boat navigates through sea arches, rocky formations, and small hidden coves. Guests can enjoy swimming stops in clear waters and take in the dramatic coastal scenery from the boat.

During the cruise, the skipper may adjust the route based on sea and weather conditions to maximize safety and wildlife viewing opportunities. After completing the stops, guests return to the original departure point.

Who is this experience best for

This tour is best suited for travelers who want a short, relaxed marine experience that combines swimming, sightseeing, and wildlife viewing in Zakynthos. It is ideal for couples, families, and small groups looking for a half-day excursion rather than a full-day commitment. It also suits visitors interested in nature and coastal scenery who prefer a balance of light activity and time on the water.

Insider notes

Turtle sightings depend on natural conditions and cannot be guaranteed, as the animals move freely within the marine park. Weather and sea conditions can influence swimming stops and the exact route, particularly around the Keri Caves and Marathonisi. Guests should bring swimwear, towels, sunscreen, and suitable footwear for boarding the boat. During peak season, these areas can be busy with other boats, so timing may be adjusted to reduce congestion where possible.

This tour is sold by Viator.