Cruise the Ionian on a glass-bottom boat to Marathonisi (Turtle Island) and the Keri Caves. Swim in electric-blue bays, watch for loggerhead turtles, and explore sea-carved limestone cliffs on this 3–5 hour half-day outing.
More ways to explore the area's outdoor wonders
The boat eases out of Agios Sostis and the Ionian opens like a page of cobalt and turquoise. Salt lifts, gulls wheel, and beneath the glass-bottom panel a scatter of silver fish moves as if directed by the sea itself. Within minutes the coastline changes from low sand to sheer limestone, cliffs streaked with white where the waves keep score.
Difficulty
easy
Duration
3–5 hours
Fitness Level
Suitable for most fitness levels; requires basic mobility for boarding and brief swims
Wildlife
History
The 1953 Ionian earthquake reshaped Zakynthos’ coastline, isolating features like Cameo Island and influencing local harbor layouts.
Conservation
Laganas Bay and Marathonisi are protected nesting zones; reputable operators follow distancing rules and limit disturbance during nesting season.
Reserve your spot on the Zakynthos Half Day Tour and Cruise Turtle Island and Keri Caves today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring reef-safe sunscreen
Protect skin and the marine environment—apply before boarding to avoid sticky residue on gear and boats.
Pack a snorkel and mask
Swim stops offer excellent visibility; your own gear fits better and stays sanitary.
Time for wildlife
Early morning departures increase chances of encountering turtles and calmer seas; afternoons can be windier.
Footwear for boarding
Wear slip-resistant sandals or water shoes for rocky docks and wet decks.
Snorkel mask and snorkel
For clearer, hygienic snorkeling during swim stops and closer views of marine life.
summer
Reef-safe sunscreen
Prevents sunburn and protects sensitive marine ecosystems like turtle nesting beaches.
summer
Water shoes
Helpful for boarding, short rocky landings, and moving on wet decks.
summer
Light windbreaker
Useful for cooler mornings or choppier conditions, especially in spring and fall.
spring