What the day looks like
You leave one of the marinas in the morning under engine, get the sails up once you are past the harbour, and spend the day crossing to Šolta, Brač or the Drvenik islands with a couple of swim stops and lunch in a bay or a village. The wind on this coast is dependable in a way it is not in most places: the maestral fills in from the north-west most summer afternoons and takes you home. Reckon on seven or eight hours.
For the island itself, see the Brač and Zlatni Rat day trip.
Sailing versus the speedboats
A fast RIB will show you five places in a day; a sailing boat will show you two properly. If you want to tick off the Blue Cave, book a speedboat. If you want a day where the engine is off, the only sound is water, and the swimming stops last as long as you want them to, this is the one. It is also the only boat day that is better in a bit of wind rather than worse.
If the Blue Cave is the point, the Blue Cave and five islands day is the fast-boat version.
Booking a berth or the whole boat
Most day-sail operators run small yachts taking six to eight people and will sell you either a single place or the whole boat. A shared place is roughly €120–160 a head including the skipper; taking the boat privately runs into several hundred for the day. If you want to learn something rather than be ferried, ask for a discovery sail — many skippers will hand you the helm and teach you the basics for the same money.
For a shorter evening on the water, the Šolta sunset swim cruise is five hours on a ten-person boat.
Things to do in Split
Boat trips and tours
Split in one day