From Ag Anna: Rina’s Cave and Ano and Kato Koufonisi Cruise

Set sail for a full day of clear water and island time. This $94 cruise from Agia Anna combines a swim at hard-to-reach Rina’s Cave with several hours on Ano Koufonisi, all aboard the 25-meter Mikros Kosmos II. I especially like the generous homemade lunch and the easy balance between time at sea and time on land. The main catch is the long sailing time, and strong wind can change the planned stops.

The boat has sunbeds, loungers, snorkel gear, life jackets, and floating noodles, so you can settle in without packing half a beach shop. I also like the family-run feel and friendly crew. Just know that this is not a guided sightseeing trip: there is little historical commentary, and the front sunbeds are limited, so arriving early matters.

Key things to know before booking

• Rina’s Cave is reached only by sea: You get about 90 minutes for swimming, snorkeling, jumping from the boat, and walking to a nearby pebble beach with a natural spring.
• Lunch is a real part of the experience: Expect souvlaki, salad, potatoes, pasta, rice with vegetables, spetzofai, bread, fruit, and vegetarian choices.
• Ano Koufonisi gets about three hours: Use the time for the village, nearby beaches, shopping, or a low-cost sea taxi to other beaches.
• The sailing takes time: The outward journey to Rina’s Cave takes roughly 90 minutes, while the return can feel longer if the wind picks up.
• This suits confident swimmers: It is not recommended for non-swimmers, people prone to seasickness, wheelchair users, or unaccompanied minors.
• The plan depends on weather: Kato Koufonisi is included when conditions allow, but wind can alter the route or prevent a stop.

What this Naxos boat day is really like

The day begins at 9:45 a.m. at the taxi piazza in Agia Anna, where a dock leads you to the Mikros Kosmos II. The boat returns at about 7 p.m., making this an 8.5-hour outing rather than a quick morning trip.

You sail along the western coast of Naxos before reaching Rina’s Cave after roughly an hour and a half. From there, the schedule usually moves toward Kato Koufonisi, an uninhabited island, and then Ano Koufonisi for three hours of free time. The exact order and number of stops can change with the wind.

I would think of this as a relaxed sea day with two strong highlights, not as a tightly narrated island tour. The crew handles the boat, food, drinks, and swimming equipment, but you are largely free to make your own fun.

Rina’s Cave: the best swim of the day

Rina’s Cave is the first major stop, and it gives the trip its sense of adventure. The cove is approachable only by sea, so arriving by boat makes the setting feel more secluded than an ordinary beach stop.

You have about 90 minutes here. You can swim into the cave, snorkel near the boat, jump from the upper deck into the water, or walk onto the nearby pebble beach. A natural spring is located near the beach, adding a small point of interest beyond the swim itself.

The water is repeatedly praised for its clarity, and this is the place to bring your mask. Snorkel equipment is available on board, but bringing your own can be useful if you prefer a better fit or want to avoid waiting for equipment.

The jump from the boat is optional. You do not need to be an athlete, but you should be comfortable entering open water and climbing back aboard. Life jackets and floating noodles are available, though the experience is best suited to confident swimmers.

Rina’s Cave is also where the crew prepares lunch. After swimming, you return to a large spread of local-style food. The meal is not a restaurant tasting menu, but it is plentiful and practical after time in the water.

The onboard lunch is more than a snack

Lunch is one of the strongest parts of the day. The meal includes Greek salad, oven potatoes, pasta, spetzofai, rice with vegetables, fresh bread, fruit, and pork or chicken souvlaki. Vegetarian food includes salad, potatoes, and rice with vegetables.

Water is available throughout the trip. During lunch, Coca-Cola, Sprite, orange juice, and wine are included. Beer, cocktails, extra soft drinks, and snacks cost more and can be purchased on board.

The food is prepared with local Naxian products, and the portions are large. Several people specifically praise the fresh cooking and the amount served, so I would eat a light breakfast. The practical appeal is clear: you are not paying for a basic sandwich at sea and then hunting for lunch on an island.

The wine is included, though it may not impress serious wine drinkers. One useful detail from the day is that drinks are served efficiently during lunch, while the return journey may include watermelon and a homemade sweet dessert. Food allergies should be reported when booking so the crew can explain the available choices.

Kato Koufonisi depends on the wind

Kato Koufonisi is uninhabited, and the boat may stop there if the weather permits. Its appeal is simple: open space, clear water, and a quiet island setting with little development.

This stop can be beautiful, but it is not packed with activities. If the boat spends extra time there because wind prevents the Ano Koufonisi stop, you may find yourself mainly swimming, sitting, and enjoying the shore. That is wonderful if you want a quiet beach day, but less satisfying if you expect shops, cafés, or sightseeing.

The weather caveat matters. Strong winds have caused route changes, including missed stops and longer time at Kato Koufonisi. The crew cannot guarantee every planned location when sea conditions change.

If you want a day based around swimming and sun, Kato Koufonisi can be a fine addition. If your priority is walking through a village, Ano Koufonisi is the more useful stop.

Three hours on Ano Koufonisi

Ano Koufonisi is the main land stop, with about three hours to use as you wish. This is not a guided walk. You can stroll through the village lanes, shop, eat or drink independently, or head to one of the nearby beaches.

Ammos Beach is singled out as especially beautiful, and the water around Koufonisi is often described as exceptionally clear. You can spend all three hours swimming and sunbathing, or split the time between the village and the coast.

A low-cost sea taxi may also take you to other beaches for a brief visit. That option can help if you want to see more of the island without walking the whole way, but it adds another expense and depends on availability.

Three hours is a useful amount of time. It gives you room to get off the boat, find your bearings, walk a little, and swim without turning the stop into a frantic dash. Still, do not expect a full island tour. The stop is free time, not a history lesson.

Life aboard the Mikros Kosmos II

The 25-meter sailing boat provides sunbeds, loungers, shaded areas, snorkel gear, life jackets, and sea-pool noodles. The boat is described as spacious and comfortable, though seating quality can feel less important at the beginning than it does after several hours at sea.

Front sunbeds are limited. People who want one should arrive early, but simply arriving 40 minutes ahead may not guarantee a front position. Some passengers have found that sunbeds remain occupied by belongings during the island stop, leaving fewer good places for the ride home.

I would treat the front sunbeds as a bonus, not a promise. Bring a hat and sunscreen, since shade is limited in some parts of the boat. A book, small game, or downloaded entertainment is sensible for the long return sail.

The boat can feel crowded when capacity is high, especially after earlier bad-weather cancellations bring extra passengers to a later departure. Even so, the available comments describe the boat as generally clean, well laid out, and comfortable enough for a full day.

Crew, atmosphere, and the lack of commentary

The crew receives strong praise for friendliness, helpfulness, and hospitality. The family-run character is part of the charm, especially around lunch, when the cooking and serving feel personal rather than heavily formal.

The captain is described as entertaining, and music contributes to the holiday mood. You can expect a sociable boat day rather than a silent ferry crossing.

The tradeoff is limited communication. There is no guide aboard, and commentary about Naxos, Rina’s Cave, or the islands is minimal. English ability can vary among the crew, and some passengers have found it difficult to get detailed information.

That will not bother you if you mainly want swimming, food, and scenery. If you want archaeological facts, island history, or a running explanation of every landmark, this is the wrong style of excursion.

A clear safety briefing has also not always been provided. Life jackets are available, but I would pay close attention to the crew’s instructions and ask if anything is unclear before entering the water.

The long sailing time and seasickness question

The boat leaves Agia Anna at 9:45 a.m. and reaches Rina’s Cave after about 90 minutes. After the stops, the return to Naxos can take two and a half hours or longer, especially when the wind rises.

That time is part of the experience, not dead space. You get views along the Naxos coast, views toward other islands, and a chance to sunbathe, read, talk, or simply watch the sea. Still, you should not book this expecting nonstop activity.

People prone to seasickness should think carefully. The open water, long return, and changing wind can make the ride uncomfortable. Eat lightly before boarding, stay where you can see the horizon, and bring any personal medication you normally need. Seasickness medication is not listed as an onboard service.

The route is also weather-sensitive. Rina’s Cave may remain the major highlight, while Kato Koufonisi or another swimming stop can change. If you need a fixed schedule, this cruise may frustrate you.

Is $94 good value?

At $94 per person, the price is strong for an 8.5-hour day that includes transport by boat, a substantial lunch, water, selected soft drinks, wine with lunch, and use of swimming equipment.

You are also paying for access to places that are difficult to reach independently, especially Rina’s Cave. A separate boat rental would cost more and require you to manage the route, fuel, food, safety equipment, and navigation yourself.

The value is highest if you will use the inclusions. Swimmers who eat lunch aboard, use the equipment, and enjoy three hours on Koufonisi get a full day for the price. The value is weaker if you dislike long boat rides, cannot swim, or want a guided cultural tour.

Compared with a basic transfer to Koufonisi, this offers far more. Compared with a private sailing charter, it is much less expensive but also less flexible and more communal.

Who should book this cruise?

I would recommend it to confident swimmers, couples, families with older children, and anyone who wants a relaxed day away from Naxos beaches. The mix of a cave swim, a generous meal, open-water sailing, and free time on Koufonisi gives you several ways to enjoy the day.

It is particularly good for people who value atmosphere over formal guiding. You can jump from the boat, swim with a noodle, eat until you are full, and wander Ano Koufonisi at your own pace.

I would hesitate if you are prone to seasickness, need wheelchair access, dislike sitting on a boat for several hours, or want detailed historical information. Unaccompanied minors are not permitted, and the experience is not suitable for non-swimmers.

Pack sunglasses, a sun hat, swimwear, a towel, sunscreen, beachwear, and personal medication. Wear practical shoes rather than high heels. Ask about pickup if you need it, since free transfer is available only from specific meeting points and times.

Should you book the Mikros Kosmos II?

Book it if your ideal Greek island day includes clear water, a hearty local lunch, a friendly crew, and enough free time to choose between swimming and wandering. Rina’s Cave is the standout stop, while Ano Koufonisi gives the day a proper island finish.

Skip it if you want a short, tightly organized outing with constant commentary. The boat ride is long, sunbeds are limited, and wind can alter the plan. For the right person, though, the price buys a generous day on the water and access to corners of the Cyclades that are not easy to reach on your own.

FAQ

Where does the cruise depart from?

It departs from the taxi piazza at Agia Anna. There is a dock there, and you should look for the sailing boat Mikros Kosmos II.

What time does the cruise leave and return?

Departure is at approximately 9:45 a.m. The boat returns to Agia Anna at about 7 p.m., for a total duration of around 8.5 hours.

Is lunch included?

Yes. The onboard meal includes salad, potatoes, pasta, rice with vegetables, spetzofai, bread, fruit, and pork or chicken souvlaki. Vegetarian choices are available.

Which drinks are included?

Water is provided. During lunch, Coca-Cola, Sprite, orange juice, and wine are included. Beer, cocktails, extra soft drinks, and snacks cost extra.

Is snorkeling equipment available?

Yes. Snorkel equipment, life jackets, sunbeds, loungers, and floating sea noodles are available on the boat.

How much free time do I get on Ano Koufonisi?

The planned stop on Ano Koufonisi lasts about three hours. You can walk through the village, shop, swim, visit nearby beaches, or use a low-cost sea taxi.

Is the cruise guided?

No. There is no guide aboard, and historical commentary is limited. The crew is available to help with practical needs during the trip.

Can the itinerary change?

Yes. Kato Koufonisi is visited when weather permits, and strong wind can alter the route or prevent a planned stop. Conditions can also affect the sailing time.