Zakynthos: Marathonisi, Cameo Island and Keri Caves Tour

The best part of this tour is the mix of clear-water swimming and turtle spotting in Zakynthos’s National Marine Park. You cruise from Agios Sostis toward Marathonisi, the green island shaped like a turtle, then stop at the Keri Caves before returning by minibus to an olive-oil press.

I like the easy hotel pickup and the way the day joins three different sides of Zakynthos: pretty coastal views, protected wildlife, and local food. I also like the generous hour on Marathonisi’s soft beach, with floating snack bars nearby. The main drawback is that the schedule can feel tight, and turtles are wild animals, not a guaranteed show.

• Cameo Island bridge: Pay the optional €5 entry fee to cross the photogenic bridge and swim beside this tiny island.
• Glass-bottom boat: Watch for Caretta Caretta loggerhead turtles without entering the water near them.
• Marathonisi beach: Get about an hour to swim, snorkel, rest, or buy a drink from a floating canteen.
• Keri Caves: Cruise past white beaches, limestone cliffs, rock arches, and Kamara, then swim outside a cave.
• Aristeon tasting: Finish with olive oil, olives, and traditional bread at an ecological press museum.
• Good value, with limits: At $66 per person, transport and the boat are included, but towels, snorkel gear, food, drinks, and Cameo Island entry cost extra.

Why this five-hour Zakynthos outing works

For a half-day tour, this packs in a lot. You leave from one of nine pickup areas, including Zakynthos Town, Laganas, Kalamaki, Argassi, Lithakia, Planos, Kipseli, Vanato, and Ano Vasilikos. Pickup is included within 10 kilometers of the operator’s office, and cruise passengers can arrange port pickup around their ship’s schedule.

The day is built around water, so wear your swimsuit under your clothes. You will not have a toilet on the boat or on Marathonisi, and the final chance to use one comes before boarding. Bring a towel, sunscreen, sunglasses, a hat, flip-flops, a change of clothes, and cash for the optional island entry or beach refreshments.

The boat usually carries up to 24 people. That is manageable, but it can feel cramped during the longer rides, especially when everyone wants a good view. Some groups have also experienced waiting during vehicle or boat changes, so this is not the right choice if you want a private, perfectly timed day.

Cameo Island and its little bridge

The first major stop is Cameo Island, reached from Agios Sostis by a short wooden bridge. The bridge gives you the classic photo, with the small island rising just offshore and the Ionian Sea around it.

You get about 30 minutes here for photos, a short walk, and a swim. The entry fee is €5 per person and is not included in the tour price. Some departures have included entry, but you should carry the cash and treat the fee as an extra.

Cameo is small. Do not expect a long island walk or a full beach afternoon. Its value is the setting: a quick, memorable stop with clear water and a charming approach. If your group spends time paying the fee and taking photos, the swim can be brief.

A practical point: some guides have reportedly discouraged the entry because the time is short or because they did not think the extra cost was worthwhile. I would decide for yourself. If you want the famous bridge photo and a taste of the island, €5 is reasonable. If your priority is swimming and caves, save your energy for the boat.

Turtle spotting in the National Marine Park

After Cameo Island, you board the glass-bottom boat. The glass panel is useful, but it is relatively small, so do not picture a boat made mostly of glass. You may spot turtles below as the captain moves through the protected waters around Laganas Bay and Marathonisi.

The species here is the Caretta Caretta, or loggerhead turtle. These animals are endangered, and the boat’s role is to watch without disturbing them. The captain may slow down or circle briefly when one appears, but sightings depend on the season, weather, and luck.

Summer departures have a better chance of seeing turtles, while late-season trips may produce no sightings. Other outings have seen one, two, or even three turtles, sometimes very close to the boat. You should see this as wildlife viewing, not a guaranteed performance.

The boat ride itself is part of the attraction. You pass open water, forested hills, pale beaches, and steep limestone edges. Some captains provide plenty of information, while others focus more on handling the boat. George has been especially well liked as a guide, with guests appreciating his talk about Zakynthos and everyday island life. The exact guide and level of commentary can vary.

Marathonisi, the turtle-shaped island

Marathonisi is the scenic heart of the outing. From the water, its shape makes the turtle nickname easy to understand. The island is green and largely undeveloped, with a soft sandy beach protected by the National Marine Park.

You get about an hour here. Use it for a swim, a little snorkeling, sunbathing, or a walk along the permitted part of the beach. The water is warm and clear, and this is often the most relaxing stop of the day.

Floating canteens sell snacks, soft drinks, ice cream, and alcohol. Bring cash, since food and drinks are not included. You can also bring your own refreshments. Snorkeling equipment is not supplied, so pack your own mask and snorkel if you want to see more than the surface water.

Marathonisi is also a nesting area for loggerhead turtles. Follow any marked limits and do not wander into protected sections. The beach can show signs of heavy use, including litter, so carry your waste back to the boat if bins are not available.

The hour passes quickly. If you prefer a long, quiet beach stay, this tour will leave you wanting more. If you want a sampler of the bay, the time is enough to swim and settle into the setting without spending the whole day on one beach.

The Keri Caves by boat

Back on the boat, you follow the coast toward the Keri Caves. Wind, waves, and time have cut openings into the pale rock. You pass cliffs dropping into the sea, small beaches, and natural arches, including the well-known Kamara rock arch.

The scenery is best enjoyed from the water. The boat gets close to the cliffs, giving you a better view of the rock texture and the contrast between white stone, dark openings, and blue water. If the ride is fast, spray can reach the seats, so keep your camera and phone protected.

There is a swimming stop of about 20 minutes just outside a large cave. This is not a beach landing. You jump or climb into the sea from the boat, so it suits confident swimmers more than anyone who needs easy access. The water is clear, and a snorkel makes the stop more interesting.

Some departures include two swim opportunities, one near the caves and one at Marathonisi. You should not count on a long guided explanation of every cave. The boat captain may give limited commentary, though the scenery carries much of the stop.

Finishing at the Aristeon Olive Oil Press

Once you return to the port, a minibus takes you to the Aristeon ecological olive-oil press museum in Lithakia. The visit lasts about 30 minutes and gives the tour a useful local-food finish.

You learn how olive oil has been produced on Zakynthos, then taste local olives and traditional bread with several flavored extra virgin olive oils. The flavors are most likely lemon, orange, and garlic. This is a quick tasting, not a full cooking class or a long museum visit.

I like this stop because it connects the sea excursion to daily island life. You can taste something made locally rather than ending with one more scenic viewpoint. The press also sells olive oil and beauty products, so you may find a practical souvenir.

The tone can lean toward a shop visit. Some guides give a useful explanation, while others spend more time encouraging purchases. One German-speaking presentation was praised for being especially clear, but the language offered on the tour is English and Greek. If you would rather have another hour on the beach, this is the part you may find least essential.

Price, transport, and the real value

At $66 per person, the price is fair for a five-hour package that includes hotel pickup and drop-off, bottled water, the boat ticket to Marathonisi, the coastal cruise, two water stops, and the olive-oil tasting. You would pay more and handle more planning by arranging transport, a boat, and a separate food visit yourself.

The value depends on what you want from the day. The tour is strong if you want a simple introduction to the southern coast and do not want to rent a car or compare boat operators. It is weaker if you want long beach time, a small private group, or detailed talks at every stop.

Transport is by air-conditioned minibus, but a nine-seater can feel tight. The exact vehicle and group size vary. Pickup is normally outside your hotel about 30 minutes before the listed start time, or you can meet at the provider’s office 10 minutes before departure if you have your own transport.

Cruise passengers should contact the operator with their ship schedule. Pickup and drop-off can be adjusted around port timing, and the tour has been used for same-day shore visits. Still, leave a sensible margin before your ship’s departure, since road traffic and boat timing can change.

The tour has free cancellation up to 24 hours before departure, and you can reserve now and pay later. It is not suitable for wheelchair users or people with mobility impairments. You need to manage the bridge, minibus, boat, beach, and swimming stops without assistance.

What to pack for a smoother day

Pack light. A dry bag or waterproof phone pouch is useful because the boat can move quickly and spray may reach the seats. You will want:

• Swimsuit worn under your clothes
• Towel and a dry change of clothes
• Sunscreen, hat, and sunglasses
• Flip-flops or secure beach footwear
• Snorkel and mask if you have them
• Cash for Cameo Island, snacks, and drinks
• Camera or phone with waterproof protection

There are no toilets on the boat or Marathonisi. Use the facilities before boarding, and do not rely on the floating canteens for every need. Bottled water is included, but meals are not.

Who should book this tour?

I would choose this for a first visit to Zakynthos, especially if you are staying near Laganas or want an easy half-day from a cruise ship. Families with older children, couples, and anyone who likes swimming more than museum time should find plenty to enjoy.

It also suits people who want a little local culture without giving up the coast. The olive-oil stop is short, and the main focus remains the boat, turtles, caves, and beach.

I would look elsewhere if your top goal is a long visit to Cameo Island, serious turtle research, or a quiet private cruise. Wildlife sightings are never certain, and the group boat can feel crowded. The itinerary is broad rather than slow, so you get many highlights but limited time at each one.

Should you book the Marathonisi and Keri Caves tour?

Book it if you want a well-priced sampler of southern Zakynthos with transport included. The strongest parts are the clear swimming water, the hour on Marathonisi, the dramatic Keri coastline, and the chance to spot a loggerhead turtle.

Go in with practical expectations: Cameo Island costs extra, the boat’s glass panel is small, the caves receive a quick visit, and turtle sightings are not promised. If George, Sakis, Nicholas, or another attentive guide leads your group, the commentary can add a lot, but the exact guide varies.

For most visitors, this is a good first-day choice. It gives you the main sights, leaves time for other plans, and asks little planning from you. Just bring cash, a towel, and a willingness to share the boat.

FAQ

How long does the Zakynthos tour last?

The tour lasts about five hours, including minibus transfers, the boat trip, the island stops, and the olive-oil visit.

What islands does the tour visit?

The tour visits Cameo Island and Marathonisi. Cameo Island is reached by bridge, while Marathonisi is reached by boat.

Is the Cameo Island entrance fee included?

No. Entry costs €5 per person and is paid separately. Some departures may handle entry differently, so carry cash.

Are turtle sightings guaranteed?

No. Caretta Caretta turtles are wild animals, so sightings depend on conditions and season. The glass-bottom boat gives you a chance to look for them without disturbing them.

How long do you spend on Marathonisi?

You get about one hour on Marathonisi for swimming, snorkeling, relaxing, and buying refreshments from floating canteens.

Are snorkeling equipment and towels provided?

No. Snorkeling equipment and towels are not included. Bring your own snorkel and towel if you want to use them.

Are there toilets on the boat or Marathonisi?

No. Use a toilet before boarding the boat because there are no toilets on the boat or on Marathonisi Island.

Is hotel pickup included?

Yes. Pickup and drop-off are included within 10 kilometers of the provider’s office. Pickup is available from listed areas including Laganas, Kalamaki, Zakynthos Town, Argassi, Lithakia, Planos, Kipseli, Vanato, and Ano Vasilikos.