Small boats show Zakynthos fast. This 5.5-hour outing links the Keri Caves with Marathonisi, so you get classic cliff views and turtle-island scenery without living on a bus. I like that the plan is built for quick, happy moments at the water, including chances to get in and swim.

I also like the small-group feel (max 12) and the fact that you’ll have an in-person guide working in English and French. Lunch is included too, and in practice that means you’re not stuck paying for food mid-day when the schedule is moving.

One real drawback to note up front: there’s no restroom at Agios Sostis port or on the boat. And because there are no snack or drink options you can buy at the port, bring what you’ll want for the day. If you’re sensitive to waves, that open-water time matters.

Key takeaways before you go

• Keri Caves + Marathonisi in one smooth coastal route, with lots of sea views packed into a half-day
• Small group (max 12), which usually keeps the experience friendly and easy to manage
• Lunch included, and it’s often handled at a sit-down restaurant stop like El Greco
• No restroom access at Agios Sostis port or onboard, so plan before you arrive
• Drinks not included, and you can’t buy them at the port—bring your own
• Captain-led information on the boat is common, so don’t expect a guide walking through the whole ride

Why this Keri Caves and Marathonisi route fits Zakynthos so well

Zakynthos is one of those islands where the best parts are on the water and along the coastline. This small-boat format is a practical way to see the big-name areas without turning your day into an all-day project.

The two highlighted stops do different jobs. The Keri Caves area is all about dramatic coastal scenery and cave-lined coastlines you can view from the sea. Marathonisi, often called Turtle Island, is where the trip earns its nickname: you’re set up for the kind of close-to-nature animal spotting and photo moments that don’t happen as easily from land.

And because it’s a smaller operation (max 12 people), the vibe tends to feel more personal than the giant-boat circus. You still move at a travel-ready pace, but you’re not buried in a crowd.

Pickup in Laganas and getting to Agios Sostis port

The day starts with a 10:00 am start time, and pickup is offered. If you’re being collected, Cretan Holidays contacts you a few days before your tour with the exact details. You’ll also use a mobile ticket, so keep that on your phone and ready when the pickup happens.

From a practical point of view, plan to be ready at pickup time even if your day feels short on paper. Coastline tours can have hidden time sinks: small delays at ports, waiting for boarding, or simply the rhythm of boats coordinating with the shore.

One logistics point you should take seriously: there are no restroom facilities at Agios Sostis port. That means your best move is to arrive prepared, then keep water/sunscreen manageable until you’re back on land.

Keri Caves stretch: what that 3-hour cruise is really for

This trip includes a 3-hour boat cruise focused on passing by the Keri Caves. The big value here is perspective. From shore, caves can look distant or blocked by rock. From the water, you get the full effect of the coastline’s shape and the cave openings you’d otherwise miss.

This part of the itinerary is also where you’ll often feel the rhythm of a motorboat ride. Reviews highlight that the travel is fast and efficient—less time shuffling and more time actually moving through the area. That matters on Zakynthos, because distances add up quickly if you’re driving yourself.

What to expect from this stretch:

• You’ll be mostly in viewing mode: coastline angles, cliff textures, and those cave formations you came for
• You’ll have time to settle in and get comfortable before the more activity-focused part of the day
• You’ll still feel the sea, so if you’re even slightly worried about motion, bring a plan (see the packing tips section)

A small-but-important consideration: if you’re expecting a guide to be constantly at your elbow the whole time on the boat, adjust expectations. On this style of tour, the captain often handles much of the info during the ride, with the in-person guide doing more on land and at key moments.

Marathonisi (Turtle Island) and the swim time that makes it worth it

After the Keri Caves segment, the day shifts toward Marathonisi with a 2.5-hour boat cruise passing by Turtle Island. Marathonisi is the star name, but what makes it land in your memory is the combination of sea color, coastline feel, and the chance to see turtles.

I like this part because it’s not just sightseeing. It’s built around the kind of short, happy breaks that make coastline tours feel alive—especially when the day includes time to swim. Some of the best moments on this route come from being in the water at the right spots rather than just staring from the deck.

Also, the tour’s theme includes Mizithres. Reviews specifically call out Mizithres beach and cave areas connected to the turtle island scenery. Even when the itinerary describes the time as passing by, the experience goal is still the same: give you access to the right coastal viewpoints and water time in a tight schedule.

What could be disappointing here?

• If you’re expecting long, repeated stops, the structure may feel more like a guided cruising loop than a slow-hopping adventure.
• The day can also include a notable restaurant portion after the boat time, so your total time at sea might not match your mental picture of a pure boat-only outing.

Still, if you want the Turtle Island experience without renting a boat yourself, this hits a practical sweet spot.

Lunch included: how the meal fits into your half-day plan

One reason this tour can feel like good value is the included lunch. Drinks are not included, but food is part of the package, which reduces the number of choices you have to make mid-day.

In real life, lunch can also be where your schedule expands or contracts. One person noted that the time distribution felt different than expected, including time spent at the restaurant. That doesn’t mean the tour is poorly run—it just means you should mentally file this as a half-day experience with a meal stop, not a nonstop ocean adventure.

A few helpful points:

• The guide is in person and can help you understand what you’re seeing, but the boat part may be more captain-led.
• If you’re the type who gets hungry fast, plan for lunch as part of the structure, not an optional add-on.
• If you’re hoping to snack constantly, remember there are no snack or drink purchases at the port, so bring what you need ahead of time.

Price and value: what you’re paying for (and what you’re not)

At $112.23 per person, this tour isn’t the cheapest way to see Zakynthos—but it’s also not trying to compete with bare-bones ferry trips. Here’s what you’re actually buying for the money:

You get:

• Air-conditioned vehicle transport
• An in-person guide (English and French)
• Lunch included
• A small group limit (max 12), which tends to keep the experience manageable

You don’t get:

• Drinks (and you can’t buy snacks/drinks at the port)
• Extra flexibility for last-minute preferences that would come with a private boat

So I’d frame the price as paying for convenience + guided time + food + smaller boat logistics. If you’re already planning to eat out anyway, the included lunch helps. If you tend to budget carefully on drinks, bring your preferred water or non-alcoholic options so you don’t end up spending extra later.

Also, this tour is often booked about 30 days in advance. If you’re traveling in peak season, booking earlier usually makes your life easier.

What to pack for a day with no restrooms and lots of water time

This is the part I’d rather get right than rush. The tour has a clear rule: no restroom facilities at Agios Sostis port or on the boat. That alone changes how you should pack.

Bring:

• Refillable water (since drinks aren’t included and you can’t buy them at the port)
• Something simple for your stomach if you get nauseous on boats
• Sun protection (hat, sunscreen, sunglasses). You’ll be on the water for a big chunk of the day.
• Swim stuff if you plan to get in (and a towel if you don’t want to improvise)
• A light layer if you’re sensitive to wind on the sea

If you’re prone to seasickness, take the mention in the tour details seriously. This itinerary includes multiple hours cruising on water, and even a small wave can change comfort fast.

A quick reality check on timing and guide style

The tour description calls the experience about 5 hours 30 minutes. That’s a good headline, but the day can still feel different depending on how boarding and waiting line up, plus how long lunch takes.

One useful expectation to set: on the boat, the captain may handle commentary while you’re moving. The in-person guide is part of the experience, but you might not see them constantly giving narration like a classroom teacher. That’s normal for captain-operated boat rides, and it doesn’t automatically mean you’re missing information—it just means it’s delivered differently.

If you like a ride where the captain calls the shots and you focus on sights and swims, that’s a good match. If you want an on-board guide in every moment, you may need to adjust your expectations before you go.

Should you book this Zakynthos small boat tour to Keri Mizithres and Marathonisi?

I’d book it if you want Keri Caves and Marathonisi (Turtle Island) without the stress of driving, parking, and piecing together multiple stops. The small-group size, the included lunch, and the easy flow from Laganas make it a strong choice for a half-day.

Book it with a plan if:

• You can handle being away from restrooms for the duration
• You’re okay bringing your own drinks/snacks since nothing is available at the port
• You’re comfortable with open-water time (especially if you’re prone to motion sickness)

Skip or rethink if you’re expecting a fully unbroken boat day with lots of long stops and minimal restaurant time. This tour blends sea time with a meal stop, and the balance can feel more like a structured outing than a pure floating beach party.

If you want a practical, good-value way to see Zakynthos’s coast highlights in one go, this route is a smart pick—just pack like you’re prepared for the sea, because the sea is the point.

FAQ

What time does the tour start, and is pickup included?

The tour starts at 10:00 am in Laganas. Pickup is offered, and Cretan Holidays contacts you a few days before with the exact pickup information.

How long is the tour?

The experience lasts about 5 hours 30 minutes.

What boat route does the tour cover?

You’ll pass by the Keri Caves during the 3-hour boat cruise, then pass by Marathonisi during the 2.5-hour boat cruise.

Is lunch included, and are drinks provided?

Lunch is included. Drinks are not included.

Are there restrooms at the port or on the boat?

No. There are no restroom facilities at the Agios Sostis port or on the boat.

What’s the cancellation policy if weather is bad?

You can cancel for free up to 24 hours in advance for a full refund. The tour requires good weather, and if it’s canceled due to poor weather, you’ll be offered a different date or a full refund.