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

Santorini’s most memorable sights are offshore: black volcanic rock, steaming sea water, and the quiet island of Thirasia. This five-hour trip brings all three together on a small boat, with time for a volcano walk, a swim near Palea Kameni, and lunch or a stroll in a traditional island village.

I like the small maximum group of 24, which makes the boat feel more personal than the big excursion vessels. I also like the stop at Thirasia, where you get a welcome break from Fira and Oia. The main drawback is that the volcano hike is hot and steep, while the hot spring swim can be brief if the schedule slips.

Key points to know before you book

• Three very different stops: Walk across black volcanic ground at Nea Kameni, swim near sulfur springs at Palea Kameni, then visit traditional Thirasia.
• A small boat matters: Captains such as Panagiotis and Manos have been praised for friendly service and for reaching stops before larger boats.
• The volcano walk is self-guided: You pay a separate €5 entrance fee and hike without a guide.
• The hot springs are not a shallow pool: The water is deep, and you need to swim from the boat. Foam noodles are provided.
• Thirasia is the calmest stop: You have free time to walk through Manolas or eat at a waterfront taverna.
• Budget for extra costs: The cable car is €10 each way, the volcano is €5, and food at Thirasia is not included.

Why this boat trip works well for Santorini

Santorini is famous for white villages perched above the caldera, but the volcano explains why the island looks the way it does. This trip lets you see that story from the water and on foot. You sail through the caldera, step onto a young volcanic island, swim beside another volcanic island, and finish in a community that still feels far removed from Santorini’s busiest towns.

The tour lasts about five hours and starts at 10:15 a.m. from Santorini’s Old Harbor. That timing gives you a full morning and early afternoon without using your entire day. You return to the same harbor after the boat ride, so you do not need to arrange a separate return transfer.

At $83, the price is reasonable if you want several experiences in one outing. The fare includes the boat, a restroom, one bottle of water, a towel, foam pool noodles, one glass of local white wine, and free time on Thirasia. Still, the extra charges matter. You need to pay €5 for Nea Kameni, and the cable car costs €10 each way if you use it to reach the harbor. Lunch and other food are also on your own.

The small group is a real advantage. A smaller boat can reach the volcanic stops before some of the larger vessels, giving you a better chance at a quieter walk and less crowded swim. The tradeoff is space. A small boat can feel cramped when everyone is boarding, changing, or drying off, and open-water crossings may be choppy.

Getting down to Santorini’s Old Harbor

The meeting point is Santorini Sea Trips at Anemos Old Port. The harbor lies below Fira, at the foot of the cliffs. You can reach it by cable car, by walking the long stairway, or by riding a traditional donkey.

For most people, the cable car is the simplest option. At €10 each way, it is not a small add-on, so include it in your day’s budget. The operator provides directions and communication before the trip, including WhatsApp contact in some cases, which helps when you are trying to find the right office or cable car area.

Allow enough time to get down. The harbor can be busy, and boarding a boat requires everyone to arrive promptly. If you walk down, remember that the return climb is not casual, especially after a swim and a hot volcano walk. The boat returns to the same harbor, so the uphill trip is part of your planning.

The Old Harbor itself has tavernas, small shops, and cafes beside the water. It is a pleasant place to wait, but do not count on a long relaxed breakfast if your start time is 10:15 a.m.

Nea Kameni: one hour on a young volcanic island

After about 20 minutes of sailing through the caldera, you reach Nea Kameni. The island is dark, rocky, and starkly different from the white villages high above Santorini. Its ground was formed by volcanic activity, and the black lava gives the stop a spare, almost otherworldly look.

You have about one hour and 15 minutes here. The walk is on your own. There is no guide leading the group, so you need to watch your footing, stay aware of the heat, and pace yourself. The path leads toward the crater area, where you can see the volcanic surface and look back toward the caldera.

The extra entrance fee is €5 per person. Bring cash, since the trip information specifically warns that cash is needed for the volcano walk. Comfortable shoes are important. Sandals may be fine for the boat, but uneven volcanic ground is not the place for flimsy footwear.

The hike is manageable for many people, but it is not effortless. In August heat, the dark rock absorbs the sun, and there is little reason to rush. One particularly useful detail is that some people find the climb harder than expected. You should treat this as a real walk, not a quick photo stop.

There is no donkey service included for the climb, and the tour does not provide a guided geology talk. If you want detailed facts about volcanic history, this may feel light on interpretation. If you prefer to walk at your own speed, the freedom is useful.

Palea Kameni: a warm swim from the boat

From Nea Kameni, the boat continues to Palea Kameni, home to the famous hot springs. The water contains sulfur, iron, and other volcanic minerals. The color and warmth can vary, and the water is generally warmer than the surrounding sea, though it is not the same as entering a heated swimming pool.

You get about 30 minutes at this stop. The boat anchors near the warm water, and you swim from the boat rather than walking onto a broad beach. This is important: the water is deep, so you need to be a competent swimmer. Foam noodles are provided and can make floating easier, but they do not replace basic swimming ability.

The stop can be one of the most enjoyable parts of the morning, especially after the volcano walk. You can cool off, float, and look back at the dark volcanic shore. A towel is supplied and must be returned to the crew, so you can leave your own bulky beach towel at your accommodation.

Pack a dark swimsuit. Sulfur may stain light-colored swimwear. It is also wise to bring a cover-up or light jacket for the ride afterward. The boat can be windy, and spray is possible on open water. One useful packing tip from the supplied information is to bring a windbreaker or sweatshirt, even on a hot day.

The schedule is the weak point here. Thirty minutes sounds generous, but boarding and getting everyone into the water takes time. If the boat leaves late or passengers return slowly, your actual swim may be much shorter. One account described less than ten minutes in the water after delays. That is not necessarily every departure, but it is a good reason to be ready when the captain calls.

Thirasia: the quiet reward at the end

Thirasia was once part of the larger Santorini island before the massive eruption in the 16th century BC. Today, it offers a sharp contrast to Fira and Oia. Its traditional character is much more intact, with winding lanes, Cycladic homes, and a slower pace.

The boat gives you about one hour and 15 minutes here. You can walk toward Manolas, the island’s main village, or settle into a waterfront taverna for lunch. Food is not included, but the stop is long enough for a meal if the boat stays on schedule.

I especially like this part of the trip because it changes the rhythm. Nea Kameni is about rock and heat. Palea Kameni is about water and swimming. Thirasia gives you time to sit down, eat, and see a quieter side of the Cyclades.

Do not expect a full island exploration in 75 minutes. If you choose lunch, you may have little time for walking. If you want to see the lanes and village, keep the meal simple and watch the return time. Delays earlier in the day can reduce this stop sharply. One reported departure reached Thirasia with only about 15 minutes left, which was barely enough to order food.

That risk is worth noting because Thirasia is a major part of the tour’s value. The best approach is to listen carefully to the captain’s return instructions and avoid wandering too far from the landing area.

The boat, crew, and onboard extras

The boat is smaller than many Santorini excursion boats, with space for up to 24 people. That size helps the captain move efficiently and gives the trip a more personal feel. It also means you should not expect wide open deck space or a luxury yacht setup.

Captains named in the supplied information include Panagiotis and Manos. Panagiotis has been singled out for calm, capable handling and friendly service. Manos has also been praised for helping create a good day on the water. The crew may help with boarding and swimming arrangements, but this is not a formal guided history tour.

That distinction matters. You receive a boat captain and practical assistance, not necessarily a guide giving detailed explanations at every stop. Some departures may include useful local information, but the core experience is transport, swimming, free time, and self-guided walking.

A restroom is available onboard. You also receive bottled water, one glass of local white wine, a towel, and pool noodles. The wine is served in a small plastic cup rather than as a formal tasting, so think of it as a pleasant drink while sailing, not a wine program.

The boat ride back to the Old Harbor gives you time to dry off and enjoy the caldera views. Open water may be choppy, especially on the return, so sit where you feel comfortable and keep your belongings secure.

Who should book this five-hour excursion?

I would choose this trip if you want to combine three classic Santorini-area experiences without booking separate activities. It suits couples, small groups, and families with older children who can manage a warm walk and a deep-water swim.

It is also a good match if you want a quieter place for lunch. Thirasia feels much less developed than Fira and Oia, and the stop gives you a useful taste of traditional island life rather than another viewpoint crowded with photographers.

You should think twice if you dislike boats, struggle with uneven ground, or are not a confident swimmer. The volcano is not guided, the walk can be hot, and the hot springs are reached by swimming from the boat. The schedule also requires cooperation from everyone onboard. A late departure from one stop can reduce time at the next.

For a more educational experience, look for a tour with a dedicated guide. This trip is better for people who value scenery, swimming, and independent time over continuous commentary.

Free cancellation is available if you cancel at least 24 hours before the 10:15 a.m. start. Poor weather can also lead to a new date or a full refund. Changes made within 24 hours are not accepted, and the trip requires a minimum number of participants.

Should you book it?

Book this boat tour if you want an active half-day with volcanic scenery, a warm-water swim, and a quiet island meal. The small group, helpful captains, included towel and noodles, and early access to the stops give it good value at $83, even after adding the cable car, volcano fee, and food.

Skip it if you want a fully narrated history tour, a long soak in shallow hot water, or plenty of time at every stop. For everyone else, this is a practical way to see the caldera from the water and add Thirasia to a Santorini visit.

FAQ

How long does the boat tour last?

The experience lasts approximately five hours, beginning at 10:15 a.m. and ending back at Santorini’s Old Harbor.

Where does the tour start and finish?

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

Is the cable car included?

No. The cable car costs €10 each way. You can also reach the Old Harbor by walking the steps or riding a traditional donkey.

Is the Nea Kameni entrance fee included?

No. The entrance fee is €5 per person and is paid separately.

Is the volcano walk guided?

No. The walk on Nea Kameni is self-guided, and you are responsible for your own safety.

How long do you spend at Nea Kameni?

The scheduled stop at Nea Kameni lasts about one hour and 15 minutes.

Can anyone swim at the hot springs?

You need to be a competent swimmer because the water is deep and you swim from the boat. Foam pool noodles are provided.

Can sulfur stain swimwear?

Yes. The sulfur in the hot spring water may stain light-colored swimwear, so dark swimwear is recommended.

Is food included?

No. Food is not included. You can buy a meal or drinks during your free time on Thirasia.

What is included onboard?

The tour includes a restroom, foam pool noodles, a returnable towel, one bottle of water, one glass of local white wine, and free time on Thirasia.