Kotor: Blue Cave and Lady of the Rocks Speedboat Tour

The best part of this three-hour speedboat trip is the variety packed into a short ride: a tiny church island, a Cold War submarine tunnel, an old prison fortress, and a sea cave made blue by sunlight. You get a quick but memorable look at the many faces of Boka Bay.

I like the chance to swim in the Blue Cave, and I like that the boat enters the old submarine base rather than simply passing it. The main caution is speed: the ride can be rough, and some stops may feel rushed when the bay is crowded.

Key points to know before booking

• The Blue Cave includes a 30-minute swim stop, with snorkel masks and life jackets supplied.
• Our Lady of the Rocks includes island admission, but the small museum costs an extra €2.
• The former submarine tunnel is entered by boat, making this more than a standard coastal cruise.
• Mamula Island is a five-minute visit, so expect a quick look rather than a full fortress tour.
• The $53 price covers fuel, taxes, water, safety gear, a skipper, and a guide, which keeps the extra costs low.
• The trip suits active visitors, but it is not recommended for people with back problems, vertigo, mobility limits, or motion sickness.

A fast route through Boka Bay

This excursion begins at Sun Rays Boat Tours in Kotor. You board a speedboat and head toward Perast, with about 20 minutes on the water before the first stop.

That opening ride gives you a feel for the scale of Boka Bay. The water is enclosed by steep coastal slopes, and the boat moves quickly enough to cover ground without turning the outing into an all-day commitment. You should not expect a slow sightseeing cruise, though. The boat is built for speed, and the ride can be bumpy.

The format is available as a private trip or a small-group outing. That choice matters. A private boat gives you more control over the pace and photo stops, while a small group usually offers the better value at $53 per person. In either case, take only what you need. Large bags, oversize luggage, mobility scooters, and non-folding wheelchairs are not allowed.

Perast and the island church

The boat passes Perast for about three minutes before stopping at Our Lady of the Rocks. You do not get a long walking tour of Perast itself, so think of the town as a scenic introduction rather than a main stop.

Perast has Venetian-style buildings, the Church of St. Nicholas, and the Perast Museum. It was once an important trading center, and its position on the bay makes it one of the area’s most photogenic towns. From the water, you see the old waterfront and the pair of small islands that give this part of the bay its special character.

The stop at Our Lady of the Rocks lasts about 20 minutes. The island is artificial, and its church dates from the 15th century. The setting is the real star: a small stone island, calm water, and mountains rising behind it.

Admission to the island is included. The church museum requires an additional €2, a modest fee that is worth considering if you want more than a quick photo. Inside, you can see maritime objects and paintings connected with the island and the seafaring life of the bay.

Twenty minutes goes quickly. I would use the first few minutes to look inside the church and museum, then save time for the waterfront views. If your main goal is photography, stay aware of the boat’s departure time. This is a stop for a clear impression, not a long cultural visit.

Entering the former Yugoslav submarine tunnel

After Our Lady of the Rocks, the speedboat runs for about 25 minutes to a former submarine tunnel. This is one of the most unusual parts of the trip.

The tunnel was built during the Yugoslav period under Josip Broz Tito as a covert naval installation. Submarines could enter from the bay and hide inside the rock, away from open view. Seeing the entrance from a boat gives you a strong sense of how practical and secretive the site once was.

You spend about 10 minutes here. The guide explains the military purpose and the way the tunnel was used. Since the boat enters the structure, you get a better look than you would from a passing cruise.

The quality of this stop depends in part on the guide. The excursion is advertised with an English-speaking guide, but some recent passengers found the explanations brief and said the guide spoke little English. If historical detail is important to you, ask questions early and clearly. The physical setting is memorable even when the commentary is light, but you should not book this as a full military-history tour.

Mamula Island and its prison fortress

The boat then takes about 15 minutes to Mamula Island, where the stop lasts roughly five minutes. That short timing tells you what to expect: a look at the fortress from the water and a quick explanation, not an extended visit inside the site.

Mamula was built in the 19th century as a military stronghold. During World War II, it became a prison under Italian control. Its round stone walls and isolated position have led to comparisons with Alcatraz, though the setting here is smaller and more dramatic.

The abandoned fortress has a grim reputation, and stories of strange activity have become part of its appeal. You should treat those tales as atmosphere rather than established fact. The more solid reason to stop is the history of the site and its stark position at the mouth of the bay.

Because the visit is only five minutes, keep your expectations in check. This is a good stop for a quick photograph and a short account of the island’s past. If you want to explore old prison buildings at length, this tour will not provide enough time.

Swimming inside the Blue Cave

The final major stop is the Blue Cave, reached after about 10 minutes on the speedboat. You get around 30 minutes here, making it the longest stop of the day.

Sunlight enters through an underwater opening and reflects off the pale sea floor. The water takes on a strong blue glow, while the cave walls catch the light. The effect changes with the sun and the movement of the water, so the cave is best understood as a natural light show rather than a fixed color display.

The boat enters the cave, and you can swim in the clear water. A snorkel mask is included, along with life jackets and other safety equipment. Bring your own towel, swimsuit, and beachwear. One bottle of water per person is provided, but there is no food or alcohol included.

This is the part of the tour most affected by crowd levels. In August, many boats may arrive at the same time, and the water can feel busy. More boats also mean extra care is needed when swimming near the entrances and around moving vessels. Follow the skipper’s instructions and keep your swim close to the designated area.

The speedboat ride can also make photography tricky. At times, the boat travels fast enough that you are shaken around, so hold your camera securely and take pictures during the calmer stretches. If you are prone to motion sickness, this is a real consideration. The tour is not recommended for people with vertigo or a history of motion sickness.

How much value do you get for $53?

At $53 per person, this is a strong value if you want several major sights in one short outing. The price includes the speedboat, fuel, taxes, skipper, guide, water, life jackets, life rafts, snorkel equipment, and entry to Our Lady of the Rocks Island.

The only listed admission cost is the €2 museum fee. Food and alcohol are not included, so eat before departure and bring only a small bottle or personal item if permitted by the operator. The included water is useful, especially during the swim stop.

The main trade-off is time. You pay for access to several places, but each stop is brief. Our Lady of the Rocks gets 20 minutes, the submarine tunnel 10 minutes, Mamula five minutes, and the Blue Cave 30 minutes. That schedule works well for a first look at Boka Bay. It is less suitable if you want long museum visits, quiet walks, or detailed time at every location.

A private trip may offer better value for couples or families who want more say over the pace. A small-group trip is likely the sensible choice for solo visitors and budget-minded couples. The exact group size is not specified, so check availability when booking if personal space matters to you.

What the ride is really like

The word speedboat is important. This is not a gentle harbor cruise. You will cover a useful stretch of Boka Bay in three hours, but the boat may bounce over waves, especially when moving quickly between stops.

Some passengers found the motion tiring and said the ride was too fast for easy photography. That does not make the boat unsuitable, but it does change the kind of day you are booking. Wear secure shoes, keep loose items packed away, and do not expect to sit completely still.

The boat has life jackets and life rafts, and the skipper handles navigation. The tour is conducted in English. Communication may be less detailed than some visitors hope, so this suits you best if you want a lively outing with basic historical context rather than a long lecture.

The overall score is 4.5 out of 5 from 16 ratings, and the strongest praise centers on the scenery, the friendly crew, and the fun of the boat ride. Several Spanish-speaking passengers described the outing as very enjoyable, while a Portuguese passenger particularly liked that the boat was not full and the crew was friendly. Those positive points match the basic appeal of the trip: impressive views, an active format, and several different sights in one morning or afternoon.

At the same time, two French passengers pointed to the same weaknesses: limited English explanations, a crowded Blue Cave in August, and a rough ride that made photography harder. Those are not minor details if you are choosing the tour for history or a relaxed swim.

Who should book this Kotor boat trip?

I would recommend it to you if you have only a short time in Kotor and want to see more than the old town. It works especially well for active couples, friends, and families with older children who enjoy boats, swimming, and unusual historic sites.

It is also a good pick if you want a compact introduction to Boka Bay before deciding where to spend more time later. You see Perast from the water, visit an island church, enter a submarine tunnel, look at a former prison fortress, and swim in a sea cave. That is a lot of variety in three hours.

I would be more cautious if you have back problems, limited mobility, vertigo, or motion sickness. The tour is not suitable for wheelchair users, and non-folding wheelchairs are not permitted. Unaccompanied minors are also not accepted.

If your priority is a calm boat ride with detailed commentary, this may disappoint. If your priority is scenery and a handful of striking stops, the quick pace is part of the appeal.

Practical advice for a smoother outing

Bring your passport or ID card, swimwear, a towel, and beachwear. Keep luggage to a minimum, since large bags are not allowed and space on a speedboat is limited.

Wear something that can handle spray and sun. Secure your phone and camera before the boat accelerates, and keep your belongings close during the swim. The cave stop is long enough to enjoy the water, but not long enough to replace a full beach day.

Book with the weather in mind. You can cancel up to 24 hours before departure for a full refund, and the reserve-now-pay-later option gives you some flexibility. Starting times vary, so check availability for your preferred day.

The best season for the cave may also be the busiest. Summer offers warm conditions for swimming, but the Blue Cave can become crowded in August. A private boat may help with flexibility, though it cannot control how many other boats are already at the cave.

Final verdict: book it for variety, not a slow pace

You should book this Kotor Blue Cave and Lady of the Rocks tour if you want a fast, scenic sampler of Boka Bay with a real swim at the end. The submarine tunnel adds unusual historical interest, and the included equipment keeps the $53 price sensible.

Skip it if you need a smooth ride, a long museum visit, or detailed English commentary at every stop. For most active visitors with limited time, though, the mix of sea, history, and swimming makes this one of the more efficient ways to see the bay.

FAQ

How long is the Kotor Blue Cave and Lady of the Rocks tour?

The tour lasts three hours, including the boat rides and stops at Perast, Our Lady of the Rocks, the submarine tunnel, Mamula Island, and the Blue Cave.

How much does the tour cost?

The listed price is $53 per person.

Is the Our Lady of the Rocks museum included?

No. Entry to the island is included, but the museum costs €2.

Can I swim in the Blue Cave?

Yes. The tour includes about 30 minutes for swimming in the Blue Cave. A snorkel mask and safety equipment are provided.

Is food included?

No. Food and alcoholic drinks are not included. One bottle of water per passenger is provided.

Is the tour private or shared?

Both private and small-group options are available.

What language is the tour conducted in?

The live tour guide and activity information are in English.

Who should avoid this tour?

The activity is not suitable for people with back problems, mobility impairments, vertigo, or motion sickness. Wheelchair users, people with non-folding wheelchairs, and unaccompanied minors cannot join.