Zakynthos: Marathonisi, Cameo Island and Keri Caves Tour

Seeing a Caretta Caretta turtle through the glass floor of a small boat is the headline moment here, but the scenery does plenty of work too. You cruise from Agios Sostis past Marathonisi and the Keri Caves, with two chances to swim in clear, warm Ionian water.

I like the one-hour beach stop on Marathonisi, where you can snorkel, buy a drink from a floating canteen, or simply sit on the sand. I also like the olive-oil tasting at Aristeon, a useful taste of Zakynthos beyond its beaches. The main caution is timing: some groups find the tour feels rushed, and a full boat can feel cramped.

Key points to know before booking

• Turtle spotting is possible, not guaranteed: The boat searches the protected waters of the National Marine Park, but sightings depend on the season and the animals.
• Cameo Island costs an extra €5: You usually have about 30 minutes here, so bring cash if you want to cross the bridge and enter.
• Marathonisi is the best swimming stop: You get roughly one hour on a sandy beach with floating snack and drink stalls nearby.
• The Keri Caves are viewed from the boat: You also get a roughly 20-minute swim outside a large cave, weather and group timing permitting.
• The olive-oil stop adds local flavor: Aristeon offers bread, olives, and flavored extra-virgin oils, including lemon, orange, and garlic.
• Bring your own snorkeling gear and towel: Neither is included, and there are no toilets on the boat or Marathonisi.

Why this five-hour trip works well

Zakynthos has a wide choice of boat outings, but this one packs several southern-coast sights into half a day. You get hotel pickup, a boat ticket to Marathonisi, turtle spotting, two island or cave stops, and a short food-focused visit inland.

At $66 per person, the price is fair if you want a ready-made day with transport included. It is less compelling if you prefer long beach time, a quiet small-group boat, or a detailed cultural tour. Part of the cost goes toward convenience: you do not need to arrange transport to Agios Sostis, find a boat yourself, or work out how to reach Aristeon afterward.

The tour runs in English and Greek. Guides and drivers have included George, Nicholas, Sakis, Dimitros, Ilias, and Charry, with George receiving particularly warm praise for his island commentary and friendly manner. The quality of the spoken information can vary, though. Some departures have a proper guide, while others rely more heavily on the driver and boat captain.

Pickup is available from areas including Zakynthos Town, Laganas, Kalamaki, Lithakia, Argassi, Planos, Kipseli, Vanato, and Ano Vasilikos, generally within 10 kilometers of the provider’s office. Cruise passengers can also arrange pickup from the cruise terminal, with timing adjusted around the ship schedule.

Cameo Island and the bridge at Agios Sostis

The first major stop is Cameo Island, a small wooded island reached by a wooden bridge from the port area of Agios Sostis. The bridge gives you the classic photo, with clear water below and the little island rising just offshore.

You normally get around 30 minutes here for photos, a short swim, and a look around. The entry fee is €5 per person and is not included in the tour price. Some departures have included entry, but you should budget for the fee rather than count on that.

I would pay the fee if you want the full Cameo experience and enjoy taking photographs. The setting is unusual and easy to visit, but you should keep your expectations in check. This is a brief stop, not a full island outing, and you may have limited time before boarding the boat.

One practical point: wear your swimsuit beneath your clothes. There may not be much time or privacy for changing, and swimming is part of the plan. Flip-flops, sunscreen, a hat, and a waterproof bag for small items will make this stop easier.

Turtle spotting in the National Marine Park

From Agios Sostis, you board a glass-bottom boat and head through the protected waters around southern Zakynthos. The glass panel is useful for getting a look below the boat, but it is not an enormous viewing area. Think of it as a window for short sightings, not a huge underwater viewing platform.

The crew searches for Caretta Caretta loggerhead turtles without approaching them in a harmful way. Several departures have spotted one or more turtles, sometimes almost immediately. At other times, particularly late in the season, no turtle appears. One group saw three, while another saw none, so you should treat the turtle encounter as a lucky possibility rather than a promise.

This matters because the tour is not a swim-with-turtles experience. You watch from the boat, and the animals should be given space. The turtle-shaped island of Marathonisi is important because it is a nesting area, so marked-off sections and beach boundaries deserve respect.

The boat ride itself can be one of the best parts. The southern coast opens into white beaches, forested slopes, limestone cliffs, and sea caves. Some captains bring the boat close to the rock formations for a better view, and one captain was praised for knowing exactly how to position the boat for turtle sightings.

The tradeoff is comfort. The boat can carry up to about 24 people, and several people found it tight when full. The glass-bottom section is small, and a fast ride can spray you with seawater. That is refreshing on a hot July day, but less pleasant in October. Keep a dry change of clothes in a small bag.

Marathonisi, the hour you will want to stretch

Marathonisi is the practical heart of this outing. The island has a green, rounded profile that resembles a turtle from the water, and its sandy beach is protected by the National Marine Park.

You generally get about one hour here. That is enough for a swim, a little snorkeling, a beach rest, or a cold drink from one of the floating canteens. The water is warm and very clear, and this is the stop most likely to make you wish the tour lasted longer.

You can bring your own snacks and drinks, though bottled water is supplied. Bring cash for the floating stalls, since food and refreshments are not included. Ice cream, drinks, and simple snacks are available, but the exact choice is not guaranteed.

There are no toilets on Marathonisi. Use the facilities before you board the boat, as the instructions are clear on this point. Once you leave the port, you may be on the water for several hours without access to a proper restroom.

Snorkeling equipment is not included. If you have your own mask and snorkel, pack them. The clear water makes even a short swim more rewarding, and one-hour stops pass quickly if you first need to find or rent equipment.

You may see no turtles at the beach itself. The name Marathonisi and the protected status can create the wrong expectation. The main turtle search takes place from the boat, while the beach stop is primarily for swimming and relaxing.

The Keri Caves by boat

After Marathonisi, the boat follows the coast toward the Keri Caves. Wind and waves have cut openings into the pale limestone, creating arches, walls, and shaded entrances along the shore.

The most recognizable formation is Kamara, a natural rock arch. The boat passes through or near the arch, depending on conditions and the captain’s route. This part is scenic rather than educational, so the quality of the experience depends on how much commentary your captain provides.

You usually stop for about 20 minutes outside the entrance to a larger cave. This is your second chance to swim or snorkel in deep, clear sea water. You do not normally go far inside the cave on foot, and the stop should be understood as a boat-and-swim visit rather than a full cave tour.

I would bring a waterproof phone pouch. The combination of bright cliffs, dark cave openings, and turquoise water gives you some of the strongest photographs of the day. Just keep your camera secure when climbing back into the boat.

The swimming stop can feel short, especially if boarding takes time. On some departures, the group has opted out of swimming, while on others it has been a highlight. Tell the crew early if you want to swim, and have your towel and footwear ready rather than buried under a seat.

Aristeon Olive Oil Press in Lithakia

Back at the port, a minibus takes you to the Aristeon ecological olive oil press museum in Lithakia. The visit lasts about 30 minutes and explains how olives are processed and how olive oil has shaped daily life on Zakynthos.

You taste local olives, traditional bread, and several flavored extra-virgin oils. Lemon, orange, and garlic are among the flavors usually offered. The tasting gives the tour a useful local-food finish, especially after several hours of salt water and sun.

The stop is partly a sales visit. You can browse olive oil and related beauty products, and some people enjoy taking home items as souvenirs. If you prefer to spend every possible minute by the sea, you may find this stop less exciting than Marathonisi or the caves.

I still think it earns its place for first-time visitors. It introduces an everyday part of Greek island life without requiring a separate museum visit, and the tasting is included. Expect a compact presentation rather than a long historical tour.

Transport, group size, and timing

The advertised duration is five hours, including road transfers. The main route includes about 30 minutes by van at the start, roughly 20 minutes after the boat, and another 30 minutes for the return. Actual timing can shift with sea conditions, pickup delays, boat availability, and the number of groups being coordinated.

The minibus is air-conditioned, though some people have found a nine-seater cramped. Pickup is usually outside your hotel 30 minutes before the stated departure time. If you drive yourself, you can meet at the provider’s office 10 minutes before departure.

There have been occasional waits during vehicle or boat changes. One group also experienced a delayed pickup from Marathonisi, which made the schedule feel stressful. Cruise passengers should confirm the return timing carefully, even though cruise-terminal pickup and drop-off can be adjusted around the ship schedule.

This is not a good choice for wheelchair users or people with mobility impairments. You need to manage a minibus, a boat, a beach landing, and a swim stop. Boarding may involve stepping between surfaces, and Marathonisi has no toilet facilities.

What to pack for a comfortable day

Wear your swimsuit under your clothes. Bring a towel, sunscreen, sunglasses, a hat, flip-flops, a dry change of clothes, and a camera.

A small waterproof bag is useful for your phone, cash, and room key. Pack a snorkel if you have one, because equipment is not supplied. Bring some cash for the €5 Cameo Island entry and the floating canteens at Marathonisi.

Do not pack a large beach bag. Boat seating is limited, and a smaller bag is easier to keep dry and out of the way. Bottled water is included, but food is not.

Who should book this Zakynthos tour?

I would choose it if you want a straightforward introduction to Zakynthos’s southern coast and prefer having transport arranged. It suits couples, families with older children, cruise passengers, and anyone who wants swimming, scenery, wildlife, and a small food stop in one half-day outing.

It is also a good fit if you are staying in Laganas, Kalamaki, Zakynthos Town, or nearby resorts. The pickup saves you from arranging a taxi to Agios Sostis, and the route covers several places that would be awkward to combine on your own.

I would look elsewhere if your main goal is serious turtle watching. Sightings are never certain, and the boat spends time on caves, swimming, beach relaxation, and olive oil. I would also consider another option if you dislike busy boats or want long, unhurried stops.

The strongest parts are the clear water at Marathonisi, the coastal scenery around the Keri Caves, and the chance to see a Caretta Caretta in its protected habitat. The weaker parts are the variable guide commentary, the extra Cameo fee, and the possibility of a rushed schedule.

Should you book it?

Book this tour if you want a well-packed half-day with beautiful swimming spots, easy hotel pickup, turtle spotting, and a taste of local olive oil. At $66, it offers solid value when you would otherwise need separate transport and boat arrangements.

Before paying, accept three facts: turtle sightings are uncertain, Cameo Island costs extra, and a full boat may feel tight. Bring cash, swimwear, snorkeling gear, and patience with the schedule. If those conditions suit you, this is a sensible way to see several of Zakynthos’s best-known southern sights in one outing.

FAQ

How long does the tour last?

The stated duration is five hours, including transportation between your pickup location, the port, the boat route, the olive oil museum, and your accommodation.

Is hotel pickup included?

Yes. Pickup and drop-off are included within 10 kilometers of the activity provider’s office. Pickup can also be arranged from the cruise terminal, with times adjusted to the ship schedule.

Is entry to Cameo Island included?

No. Cameo Island entry costs €5 per person. The fee is separate from the tour price, so bring cash.

Will I definitely see a turtle?

No. The boat searches for Caretta Caretta turtles in the National Marine Park, but sightings depend on the season and the animals’ location. You watch turtles from the boat and do not swim with them.

Are food and drinks included?

Bottled water and the olive oil tasting are included. Other food and drinks are not. Floating canteens operate near Marathonisi, where you can buy snacks and refreshments.

Is snorkeling equipment provided?

No. Bring your own snorkeling equipment if you want to use it. Towels are also not included.

Are there toilets during the boat trip?

There are no toilets on the boat or on Marathonisi Island. Use a toilet before boarding the boat.