Santorini: Boat tour to Volcano, Hot Springs & Thirasia island

Santorini’s famous caldera looks even better from the water, and this five-hour trip packs three very different stops into one morning: a raw volcanic island, warm sulfur springs, and quiet Thirassia. I especially like the small-group boat, limited to 24 people, and the chance to reach the stops before larger boats arrive.

I also like the simple comforts, including a towel, bottled water, pool noodles, a restroom, and a glass of local white wine. The main drawback is that the volcano walk is unguided, steep in places, and hot in summer. The hot springs also require steady swimming, so this is not a passive sightseeing cruise.

Key points to know before you book

• The volcano walk is on your own: You pay the €5 Nea Kameni entry fee separately and hike without a guide.
• Thirassia gives you a quieter island stop: You have free time around Manolas and the waterfront tavernas.
• The hot springs are warm, not a spa pool: The water is deep enough that you need to swim, and sulfur can stain light swimwear.
• The boat holds no more than 24 people: That makes boarding and moving between stops less hectic than on larger excursions.
• The Old Harbor adds a transport challenge: Reach it by cable car, steps, or donkey, with the cable car costing €10 each way.
• The price is $83: That is fair for a boat, several stops, a towel, water, wine, and a small group, but you must add the cable car, volcano entry, and any food.

Why this boat trip works well for Santorini

This is a good choice if you want to see the volcanic side of Santorini rather than spend another half-day among the island’s white buildings and crowded viewpoints. The route shows how fire and water shaped the area, then finishes with a look at a quieter island community.

The trip lasts about five hours and begins at 10:15 a.m. at Santorini’s Old Harbor, also called Fira Port. You return to the same place. That makes the timing easy to fit into a day based in Fira, though you need to allow extra time to get down to the port and back up afterward.

The smaller boat is one of the strongest reasons to choose this outing. A maximum of 24 people is not private boating, but it is much more manageable than a large vessel. Captains such as Panagiotis and Manos have been especially attentive, and the crew can help with boarding, swimming arrangements, and basic practical needs.

Do not expect a formal lecture in several languages or a fully guided history tour. The captain handles the boat and timing, but the volcano walk is specifically unguided. Some departures may include more commentary than others, so you should book this for the places and the boat ride, not for an expert-led archaeology lesson.

Getting down to Santorini’s Old Harbor

The starting point is below Fira, at the foot of the steep cliffs. The Old Harbor has waterfront tavernas, cafes, and shops, but its main importance here is practical: this is where you board and finish.

You can reach it by the cable car, on foot via the steps, or by traditional donkey. The cable car costs €10 each way and is not included. That means a cable car round trip adds €20 per person to the advertised $83 price.

The steps are a real consideration after a morning in the sun, especially on the way back up. Donkeys are also available in the port area, but the tour information does not include donkey transport in the price. Arrive with enough time to find the meeting point and board without rushing.

The tour provider sends booking confirmation at the time of reservation, and some arrangements are handled through WhatsApp. Keep your phone available before departure, especially if you need help finding the office or confirming directions.

Sailing across the caldera to Nea Kameni

The first boat ride takes about 20 minutes and crosses the caldera toward Nea Kameni. This is the part of the day when Santorini’s cliffs make the most sense from a distance. You see the island from sea level, with the white towns high above the dark volcanic rock.

Nea Kameni is a small, rough island formed by volcanic activity. The shore is dark and rocky, and the ground has a stark appearance that feels completely different from the polished villages of Fira and Oia.

You have about 1 hour and 15 minutes here. The main task is the walk toward the crater rim. The route is not described as a guided hike, so you set your own pace and are responsible for staying safe. Wear sturdy footwear, carry water, and avoid treating this as a casual stroll.

The walk can be difficult in August heat. There is little reason to rush, but the group must return to the boat on time. You should also remember the separate €5 entrance fee for Nea Kameni. Bring cash, since the practical information provided for the tour specifically advises having cash for the volcano walk and cable car.

The reward is the view and the unusual ground under your feet. You are looking at a young volcanic island rather than an old village or beach resort. Still, you should keep expectations sensible. This is a modest volcanic hike, not a full-day mountain trek, and the tour does not include a naturalist or geology guide walking beside you.

Swimming at Palea Kameni’s sulfur springs

From Nea Kameni, the boat moves to Palea Kameni, the neighboring island known for its geothermal water. You have about 30 minutes at the hot springs area.

The swim is done from the boat or near the boat, and the water contains sulfur, iron, and other volcanic minerals. The temperature can feel warmer than expected, though it is not necessarily a hot bath. Conditions vary, and the open-water setting means you are not stepping into a shallow, tiled pool.

This point matters: the hot spring area is deep, and you need to be comfortable swimming continuously. Pool noodles are provided, which help you relax and stay supported, but they do not replace swimming ability. If you are traveling with a child who is not a confident swimmer, you may decide to skip the water and enjoy the boat instead.

Allowances for swimming can feel short because everyone must get into and out of the water. On a smooth, punctual departure, 30 minutes gives you time for a pleasant soak and swim. If boarding takes longer or the sea is choppy, your actual time in the water may be noticeably shorter.

Bring a dark swimsuit. The sulfur may stain light-colored swimwear. You also receive a towel, but it is returnable to the crew, so do not plan to keep it for the rest of your Santorini day.

Free time on traditional Thirassia

Thirassia is the most rewarding stop for anyone who wants more than geology. The island was once connected to Santorini before the huge eruption in the 16th century BC. Today, it feels far quieter and less developed than Fira or Oia.

You have about 1 hour and 15 minutes. The main village, Manolas, has Cycladic houses and winding lanes, while the waterfront offers traditional tavernas where you can order food and wine.

This is not a tightly programmed walking tour. You are given free time, so you can eat, wander, sit by the water, or simply enjoy the slower pace. That freedom is useful, but it also means you need to watch the time yourself.

Food is not included. If you want lunch, use the stop for a meal at one of the tavernas, but do not assume you can order a long, leisurely spread and still have time to explore. Delays at earlier stops can reduce the time available here.

Thirassia’s appeal comes from the contrast with Santorini’s main towns. You will not find the same concentration of shops and viewpoints. Instead, the island offers a quieter look at Cycladic life, with a chance to sit down to local food away from the busiest parts of Santorini.

The ride back, wine, and boat comforts

After Thirassia, the boat returns to the Old Harbor. The ride gives you time to dry off, watch the cliffs, and let the morning settle into a pleasant rhythm.

One glass of local white wine is included. It is served as a modest refreshment rather than a wine tasting, and you should expect a small plastic cup rather than a formal glass. The wine itself may be enjoyable, but this should not be a deciding factor if you are looking for a serious food or wine experience.

The boat includes a restroom, bottled water, and foam pool noodles. These are small details, but they matter on a five-hour outing that combines a hike and a swim. A light jacket or sweatshirt is sensible because the open water can feel windy, and spray can reach the boat even on a warm day.

The sea may be choppy in open water. If you are prone to motion sickness, take that possibility seriously and choose a place on the boat where you feel most stable. The boat is comfortable for a small group, but space can feel limited when everyone is moving around with towels, bags, and wet swimwear.

What the $83 price really covers

At $83, this trip offers solid value if you want several Santorini activities in one booking. You get the boat ride, three distinct destinations, free time on Thirassia, a towel, water, a restroom, pool noodles, and one glass of wine.

The price does not cover everything. Add the €5 Nea Kameni entry fee, the cable car if you use it, and food on Thirassia. A cable car round trip alone costs €20 per person, so the true out-of-pocket cost can be much higher than the headline price.

I think the price makes the most sense for couples, families with confident swimmers, and small groups who want a shared outing without committing to a private charter. It is less attractive if you only want a short cruise or if you dislike changing boats, hiking, swimming, and managing your own free time.

The 95 percent recommendation rate and 4.7 rating point to a dependable experience, but the practical limits are clear. The captain and boat receive strong praise, while the absence of a detailed guide can disappoint people who want explanation at every stop.

Who should book this experience

Book it if you want to:

• See Nea Kameni and the crater area without arranging separate transport
• Swim in volcanic hot spring water
• Spend time on a quieter island than Santorini
• Travel in a group of no more than 24 people
• Combine scenery, light hiking, swimming, and lunch into one half-day
• Enjoy a captain-led boat trip with useful onboard equipment

Think twice if you need a fully guided volcano walk, cannot swim confidently, or want a long, unhurried lunch on Thirassia. The tour depends on everyone returning to the boat on time, and late starts or slow boarding can shorten the stops.

Most people can take part, and service animals are allowed. Still, the volcano walk, boat boarding, steps at the port, and open-water swim make this more demanding than a simple sightseeing cruise.

Weather, cancellation, and timing details

The experience depends on good weather. If poor conditions force cancellation, you are offered another date or a full refund. The same applies if the minimum number of participants is not reached.

You can cancel for a full refund up to 24 hours before the local start time. Cancellations and changes made within 24 hours are not accepted for a refund.

The 10:15 a.m. start leaves much of the afternoon free, but the tour ends back at the Old Harbor, not at the top of Fira. Allow time to ride the cable car or climb the steps after returning.

FAQ

Where does the boat tour start?

It starts at Santorini Sea Trips, Anemos Old Port, Santorini, Thira 847 00, Greece.

What time does the tour begin?

The scheduled start time is 10:15 a.m.

How long does the experience last?

The tour lasts approximately five hours and ends back at the Santorini Old Harbor meeting point.

How do I reach Santorini’s Old Harbor?

You can reach the Old Harbor by cable car, by walking down the steps, or by traditional donkey. The cable car costs €10 each way and is not included.

Is the volcano hike guided?

No. The walk on Nea Kameni is unguided, and you are responsible for your own safety. The separate entrance fee is €5 per person.

Is food included?

No. Food is not included, but Thirassia has traditional taverns where you can eat during your free time.

Is swimming required at the hot springs?

The hot spring area is deep, and you need to swim continuously to stay in the water. Pool noodles are provided, but you should be a confident swimmer.

What is included on the boat?

The boat provides a restroom, foam pool noodles, one bottle of water, a returnable towel, and one glass of local white wine.

Can I cancel for a full refund?

Yes. You can cancel at least 24 hours before the local start time for a full refund. Cancellations within 24 hours are not refundable. If bad weather or an insufficient number of participants cancels the tour, you are offered another date or a full refund.

Should you book this Santorini boat tour?

I would book this trip if your ideal Santorini morning includes volcanic scenery, a short hike, a sulfur-water swim, and a quiet island lunch. The strongest features are the small group, capable captains such as Panagiotis or Manos, and the unusual stop at Thirassia.

I would not book it for a fully guided cultural tour or a relaxing cruise with no physical effort. Bring cash, a dark swimsuit, water-friendly shoes, a light jacket, and realistic expectations about timing. For the right traveler, $83 buys a varied and memorable look at the islands around Santorini, not just another ride past the cliffs.