Blue Cave & 5 Island Tour

The Blue Cave, Modra špilja, is a sea cave on Biševo, a small island roughly 90 minutes south of Split by speedboat. It is about 24 metres deep and 12 wide, and the thing everyone comes for is not the rock but the light. A second opening sits below the waterline. When the sun is high enough, daylight passes through that underwater hole, refracts off the white limestone floor and fills the whole chamber with a blue that has no equivalent above water. The ceiling reads silver. Your hands look like they belong to someone else.

That effect has a schedule. It builds from roughly 10:00 and fades after midday, and outside that window the cave is a dark grotto. Everything about this day is arranged around that fact: we leave Split Riva at 07:00 in high summer and 07:45 in the shoulder months, so the boat reaches Biševo inside the window with a buffer for sea state and for the queue of boats that forms at the entrance.

Inside, the visit is short: ten to fifteen minutes. Entry is by small wooden boat run by the local Biševo concession, a handful of people at a time, no swimming, no jumping in. Anyone selling you an hour inside the Blue Cave is selling you something that does not exist.

Five stops, one direction of travel, and an order chosen by wind rather than by map. Mornings on this coast are usually glassy; afternoons bring the maestral, a thermal north-westerly that builds from around 13:00 and puts a chop on the open channels. So the long exposed legs happen first, while the sea is flat, and the day works its way back toward Split through progressively more sheltered water.

From Biševo the boat runs up the south coast of Vis to Stiniva: a cove walled by cliffs that almost close over the entrance, wide enough for one boat at a time. We take it in from the water rather than anchoring, so the swimming time goes to Budikovac, Hvar and the last cove instead. It was voted Europe's best beach in 2016 and it earns it: white pebbles, a slot of sky overhead, water that shelves from turquoise to navy in about ten metres.

Then Budikovac, a shallow lagoon off Vis's eastern side that is waist-deep for a long way out. It is the calmest water of the day and the stop that makes the trip work for families and nervous swimmers.

Hvar town is lunch: two hours on the marble Pjaca, the biggest square in Dalmatia, with the Renaissance cathedral at one end and the Spanish fortress on the hill above. Long enough for a proper sit-down meal and a walk up toward the fortress, not a plate eaten against the clock.

The last swim is not in Milna harbour but in a hidden cove near Milna on the west coast of Brač, a place with no road down to the water, which is why the only people in it arrived the same way you did. Most operators skip the detour because it costs them twenty minutes. From there the run home crosses the Split channel, which stays sheltered even when the maestral is up. Back on the Riva at 17:30.

The cave is a protected natural monument and the entrance fee goes to the Biševo authority, not to us. It is the one cost on this day that is not in the ticket price, and it is collected on the island itself.

High season (20 June – 10 September): €24 per adult, €12 for children aged 6–12. Off season (1 April – 19 June and 11 September – 31 October): €18 per adult, €9 for children aged 6–12. Children under 6 go free.

Bring it in cash. There is no card machine on Biševo and none on the boat. A family of four in August is €72 if both children are over six, so plan for it rather than discovering it at the cave mouth.

On the rare days the authority closes the cave for swell, the fee is not charged and the day is rerouted: usually more time around Vis and in the water, which is a genuinely good consolation.

It suits anyone who wants to see the most of Dalmatia in a single day and does not mind ten hours of it. Twelve guests maximum, so there is room to lie down on the bow and you are never queuing for anything on board.

It is a long day on a fast boat in open water. If you get seasick, take something before boarding rather than after. Once you feel it, it is too late, and there is no turning back from Biševo. If you have a back or neck problem, the offshore legs will find it; a private charter that runs slower and stops more often is the better call.

Minimum age is 5. Children love Budikovac and Stiniva and tend to lose interest during the crossings, which is normal and survivable with a hat and a phone. Under-5s are not a good fit for this itinerary.

If your group is six or more, do the arithmetic before booking seats: at €110 each, six people is €660, and a private charter buys you your own boat, your own pace and a skipper who will change the plan for you.

Swimwear on under your clothes. The first stop happens sooner than you expect. A towel, reef-safe sunscreen and a hat you can tie down; at 23 knots an untied hat is a donation to the Adriatic.

Cash for the cave fee, and cash for lunch in Hvar: several of the smaller places on the back streets are cash-only. Water shoes are optional: the swim stops are all easy entries. Snorkel masks and fins are on board for everyone, along with wind jackets for the crossings and bottled water all day.

Leave the hard suitcase and the drone at the apartment. Storage on board is soft-bag sized, and Croatia requires a permit to fly a drone commercially around the islands.

The group departure is one boat, up to twelve guests, a fixed start that moves with the season (07:00 from 16 June to 15 September, 07:45 either side of it) and the itinerary above. It is the right choice for couples, pairs of friends and anyone travelling on their own: you get the whole route at €110 a head and you meet people.

A private charter is the same coastline with the clock in your hands. You choose the departure time, skip a stop you do not care about, stay an extra hour where the water is good, and get picked up somewhere other than the Riva. It costs more per boat and less per person once you are past six or seven people.

Both run the same fleet and the same skippers. Nothing about the boat changes, only who else is on it and who decides when to leave.