Medulin: Glass Boat Tour Experience to Kamenjak with Mermaid

Kamenjak’s Golumber Cave is the star of this short boat trip. From Medulin Harbour, you cruise across the archipelago on the Mermaid, peer through the glass bottom, stop to swim in protected water, and watch a mermaid character entertain children near the boat.

I like the three-hour length, which fits neatly into a family holiday or a busy day in Istria. I also like the mix of simple pleasures: fish below the glass, a cave visit, a swim, drinks, and a chance to photograph Porer lighthouse. The main drawback is that the route can change, and some departures may not reach the lighthouse.

Key points

• Golumber Cave: Enter or explore the cave within Kamenjak’s cliffs during the swimming stop.
• Short family-friendly format: Three hours is manageable for children and for anyone who prefers not to spend half a day at sea.
• Glass-bottom viewing: Watch local Adriatic fish beneath the boat, with a fish-feeding activity included.
• Porer lighthouse: The 1846 lighthouse is a photo stop when sea and route conditions allow.
• Mermaid entertainment: A mermaid swims near the boat and gives children something special to watch during the anchor stop.
• Practical inclusions: Drinks, music, a toilet, captain, and crew are included, but food and transport to Medulin Harbour are not.

A short sea trip with a clear family focus

This excursion leaves from Medulin Harbour and lasts three hours. That makes it the shortest boat outing in this particular program, a useful fact if you are traveling with young children, have limited time, or simply do not enjoy long hours on open water.

The boat is called Mermaid, and its glass-bottom section gives you a look at the seabed as you travel. Do not expect a full underwater tour. The view depends on water clarity, sunlight, and the boat’s movement, but it adds another layer to an ordinary coastal ride. Children can watch fish below while the boat is moving or resting at anchor.

The crew speaks English. Drinks, music, and a toilet are included, which makes the three-hour format easier to manage. Food is not included, so eat before you arrive or plan a meal for after the boat returns.

Leaving Medulin Harbour for the archipelago

You need to check in 30 minutes before departure at Medulin Harbour. Look for the advertising desk shaped like a boat beneath a large dark-blue parasol. A team member should be there to help you find the correct meeting point.

Transport to the harbour is not included. If you are staying outside Medulin, you need to arrange your own way there. That sounds minor, but it matters when you are traveling with beach bags, towels, children, or snorkeling gear.

Once aboard, the boat heads toward the Medulin archipelago. The opening part of the trip is a panoramic ride, not a guided historical tour. You will get views across the island group and have time to settle into the boat before the main stops.

I would treat this first stretch as a gentle introduction rather than the main event. The value is in the changing view, the glass-bottom section, and the relaxed pace. If you want constant commentary or a tightly packed sightseeing schedule, this may feel light.

What the glass bottom adds

The glass-bottom feature is especially useful for families. Instead of asking children to sit still during a long cruise, you can give them something to watch beneath the boat. The crew also feeds local Adriatic fish, creating a more active moment than simply looking through the glass.

Water conditions matter here. The supplied information does not promise a particular number of fish or perfect visibility, so keep expectations sensible. This is a chance to see the seabed from a moving boat, not a substitute for snorkeling.

The fish-feeding stop also gives the mermaid a role beyond decoration. During the anchor period, she swims near and under the boat and interacts with children. One account describes her swimming back and forth toward the swimming area, where she offered children something to watch. That makes this part especially appealing to younger passengers.

For adults, the fish viewing may be brief. For children, it can be the detail they remember most.

Kamenjak Nature Park and the Golumber Cave stop

The boat continues to the protected waters of Kamenjak Nature Park, where you get time for swimming. Bring swimwear and a towel, because this is not just a sightseeing cruise.

The cave of Golumber is set within the cliffs of Kamenjak. You can explore the cave during the stop, and the route allows you to enter it on your own. This gives the excursion a small sense of adventure without requiring a long hike or a difficult approach from land.

The cave is best understood as a short coastal stop, not a guided underground tour. The attraction is the setting: cliffs, sea, shade, and the chance to move from the boat into a natural rock opening. Wear secure footwear if you have it, and take care around wet surfaces. The operator does not promise a specific length of time inside the cave, so follow the captain and crew’s instructions.

The swimming stop is one of the stronger reasons to book. You are not just looking at Kamenjak from offshore. You get to enter the water and spend part of the trip in the park itself. Still, the time must be shared between swimming, the cave, fish feeding, and the other sights. If you want a long, leisurely swim, a full-day beach outing may suit you better.

Porer lighthouse and the route that may change

Porer lighthouse was built in 1846 during the Austro-Hungarian Monarchy. It is described as one of the biggest lighthouses in Croatia and provides one of the trip’s best photo subjects.

The important word is may. The advertised route includes Porer lighthouse, but the captain can change the course because of weather or sea conditions. At least one departure did not visit the lighthouse and instead passed around an island before returning to Medulin.

That variation is worth understanding before you book. You are paying for a coastal boat experience that includes several planned sights, not a guaranteed lighthouse transfer. If Porer is your main reason for going, ask about the route at check-in and keep your plans flexible.

The captain has final authority over the route. In poor weather or rough seas, the trip can be changed or canceled for safety. If canceled for that reason, you can receive a refund or arrange another date. This is sensible, but it also means you should not schedule an important connection immediately after the excursion.

What the three hours feel like

Three hours is a useful middle ground. It is long enough to leave Medulin, see part of the archipelago, visit Kamenjak, swim, look for fish, and make time for the cave. It is short enough that most families can fit it between breakfast and lunch or between other Istrian plans.

The pace is not packed minute by minute. Some time is spent traveling, and one account describes a stretch of simply cruising around an island before heading home. I would not book this expecting a nonstop sequence of major sights.

That slower section can be pleasant if you want a breeze and a view. It can feel like filler if you are an adult looking for a more active coastal adventure. The experience works best when you see the cruise itself as part of the outing, not just transportation between attractions.

Music is included, adding to the casual holiday mood. Drinks are also included, which is helpful in the sun, though you should still bring water. Sunscreen is essential, and a camera is worth packing for the lighthouse, cliffs, cave, and mermaid encounter.

Who gets the best value for $34

At $34 per person, the price is reasonable when you use the main inclusions: a three-hour boat ride, captain and crew, drinks, music, toilet, fish feeding, swimming, Golumber Cave, and sightseeing around the archipelago.

The value is strongest for families. You get several different activities in one short outing, and the mermaid gives children a clear point of excitement. A family can also avoid organizing its own boat, route, anchor spot, and cave approach.

The price is less compelling if you are comparing it with a private boat. A group of four adults and two children paid about €160 on one occasion, which is close to the listed per-person rate for six people. For a group that values privacy and control, renting a boat could offer more time at each stop, though that comparison involves different costs and responsibilities.

You should also consider what is not included. Food is excluded, and you must reach Medulin Harbour yourself. The drink inclusion helps, but bring water and snacks for before or after the ride.

Comfort, access, and sea conditions

This is not a suitable activity for wheelchair users. It is also not recommended for people with heart problems or people prone to seasickness.

The boat has a toilet, which is useful on a three-hour ride, but the supplied information does not promise special seating, shade, or step-free boarding. If you have mobility concerns, contact the provider before booking rather than assuming the boat will be easy to board.

If you are prone to seasickness, the short duration helps, but it does not remove the risk. Sit where the crew recommends, keep your eyes on the horizon when possible, and avoid booking if the sea is already expected to be rough. These are practical precautions, not guarantees.

Weather can affect both comfort and the route. The captain may alter or cancel the excursion in bad conditions. That policy protects passengers, but it also means you should keep your schedule open around the tour.

What to bring to Medulin Harbour

Pack lightly, but bring the items that make the water stop easier:

• Swimwear and a towel
• Sunscreen
• A camera or phone in a waterproof case
• Water
• Any food you want before or after the trip

You do not need to bring food for the boat because the activity is only three hours, but food is not included. A waterproof case is especially sensible if you want photos near Golumber Cave or during the mermaid encounter.

Arrive 30 minutes early. The dark-blue parasol and boat-shaped desk should help you identify the meeting point, and a crew member should be available there.

My recommendation for families and short-stay visitors

I would book this trip if you want a compact family outing with several easy highlights: a glass-bottom boat, local fish, a mermaid, swimming, a cave, and a possible lighthouse view.

I would hesitate if your priority is a guaranteed Porer lighthouse visit, a long swim, or a full day of remote coastal exploring. The route can change, and some time is spent cruising without a major stop.

For the right audience, the trip offers a pleasant introduction to the Medulin coast without taking over your day. It is not a private expedition, and it does not promise constant action. Think of it as a relaxed three-hour sampler of Kamenjak’s water and cliffs, with a strong child-friendly touch.

Book it when the short length, shared boat setting, and mermaid entertainment match what you want. Skip it when you need a more ambitious route or cannot accept the possibility of missing Porer lighthouse.

FAQ

How long is the Medulin glass-bottom boat tour?

The tour lasts three hours. Check availability for the current starting times.

Where does the tour begin and end?

It begins at Medulin Harbour and returns to the same meeting point.

How early should I arrive?

You should check in 30 minutes before the tour starts. Look for the boat-shaped advertising desk beneath the large dark-blue parasol.

Is swimming included?

Yes. The tour includes time for swimming and snorkeling in the protected waters of Kamenjak Nature Park.

Can I visit Golumber Cave?

Yes. The route includes exploration of Golumber Cave within the cliffs of Kamenjak, with the possibility of entering the cave on your own.

Will the boat visit Porer lighthouse?

Porer lighthouse is part of the planned sightseeing, but the captain may change the route because of weather or sea conditions. The lighthouse is not guaranteed on every departure.

Are drinks included?

Yes. Drinks are included. Food is not included.

Is the tour suitable for wheelchair users?

No. The activity is not suitable for wheelchair users.

What happens if the weather is bad?

The captain may change the route or cancel the excursion for safety. In that situation, a refund or an alternate tour date is available.