The coast east of Cagliari changes character every few miles. Within an hour of leaving the marina you pass city beaches, granite headlands, coves reachable only from the water and, further on, the long sandy stretches of Costa Rei. This guide covers what you can realistically see in a half day and in a full day, when the sea is at its best, how the wind decides your route, and what a private boat actually costs in South Sardinia.
What a private experience means here
The boat is never shared. Your group has it to itself, with a local skipper at the helm. That is the practical difference from a ticketed excursion: nobody else sets the timetable, nobody else chooses where to stop, and if everyone wants to stay an extra half hour in one cove, you stay.
It also means the route is decided on the day. In Sardinia the wind, not the brochure, determines where the water is calm. A skipper who sails this coast every week knows which bay is sheltered on a given morning, and that knowledge is worth more than any itinerary fixed months in advance.
Four hours or eight: how far you actually get
Four hours covers the stretch between Marina di Capitana and the headlands just east of it. It is enough for two or three swimming stops, a proper snorkel and an unhurried return. It suits first timers, families with young children, and anyone who wants the sea without giving up the whole day.
Eight hours opens the coast properly. With a full day you reach Villasimius and, when conditions allow, the start of Costa Rei. You swim in more than one bay, eat on board, and come back with the light already turning gold. If it is your only day at sea during the holiday, take the full day.
The coast, going east
Sella del Diavolo and Poetto
The promontory closing the gulf of Cagliari is the first landmark you leave behind. From the water it reads clearly as the saddle that gives it its name, with the long Poetto beach unfolding beneath it. It makes a good first swim while the boat is still in sheltered water, and it is the view of the city almost nobody sees from land.
Mari Pintau and Geremeas
Pebble beaches and clear shallows a short run from the marina. The name Mari Pintau means painted sea, and on a still morning the description is literal: the bottom shows through in bands of green and blue. These bays are the heart of a four hour trip, and they are usually the first place a skipper heads when the wind is from the north.
Villasimius and Isola dei Cavoli
Granite boulders, white sand and the island that closes the cape. The seabed around Isola dei Cavoli lies inside a protected marine area, which is exactly why the snorkelling there is worth the crossing: the fish are used to being left alone. Reaching it comfortably, with time to swim rather than just arrive, needs a full day.
Costa Rei and the southern coves
Further north east the coastline flattens into long sandy stretches and shallow turquoise water. Cala Pira and Cala Sinzias are the names worth knowing. This is the furthest point of a full day and it depends on the sea being kind, so treat it as a possibility rather than a promise.
When to go
The season runs from May to October. June and September are what people who can choose their dates tend to pick: the water is already warm, the light lasts into the evening, and the coves are not crowded. July and August bring the strongest demand and the busiest anchorages, so those dates need booking well ahead.
May and October are quieter in every sense, though the sea is cooler and the weather less settled. For a first visit they are underrated: you often get whole bays to yourself.
The wind matters more than the calendar
The mistral blows from the north west and, along this stretch of coast, it tends to flatten the water rather than churn it. A windy forecast therefore does not automatically mean a cancelled day. The wind to watch is the scirocco, warm and from the south east, which closes the exposed bays and pushes swell onto the beaches you wanted to swim from.
This is why departures are confirmed the day before rather than weeks earlier. If conditions are genuinely unsafe you are contacted, and you either agree a new date or you are refunded in full.
Morning, afternoon or sunset
Mornings give the clearest water and the emptiest coves, because the wind usually builds through the day. If snorkelling is the point of the trip, go in the morning.
Afternoons are warmer and better suited to long swims and a slower rhythm. Families with children often prefer them, since nobody has to be at the marina early.
The sunset departure is a different proposition entirely. Less swimming, more anchoring in a quiet bay with a glass in hand while the light goes from gold to pink behind the headland. It is the one people book for an anniversary or a proposal, and it is the hardest date to get in August.
Who it works for
Couples, families and groups of friends, small or large. Children are welcome and the shallow coves near Capitana are calm enough for small swimmers. For a birthday, a bachelorette day or a private celebration, say so in advance: the route and the timing change to suit the occasion rather than the other way round.
What it costs
The boat costs €100 an hour, with a minimum of four hours: €400 for four hours and €800 for a full day. The price covers the boat and the skipper. Fuel is paid separately and depends on the route, which is why a day spent in the nearby coves costs less to run than a crossing to Costa Rei.
Payment is taken in full at booking, by card. A booking can be cancelled free of charge up to seven days before the date.
What is already on board
Towels, ice, drinks and snorkelling gear are there when you arrive. Bring reef safe sunscreen, a light layer for the return leg, and something soft for your feet. If you want particular food or a specific bottle on board, ask when you book rather than on the day.
Where you leave from
Departures are from Marina di Capitana, Molo 10, berth 21, in Quartu Sant’Elena, roughly fifteen minutes east of Cagliari by car. There is parking at the marina. Costa Rei departures leave from a different point, which is confirmed with you once the date is set.
Booking a private boat tour in South Sardinia
Choose the duration first, then the time of day, then the date. The rest, the route, the stops, the order of the swims, is settled between you and the skipper on the morning, with the wind in front of you rather than a map.