Day trip or stay.

What the last boat decides

Formentera is small enough to visit in a day and large enough to make that day feel rushed. The fast ferry from Ibiza Town takes about half an hour to La Savina, so a morning arrival is easy and a full circuit looks possible on paper. What the timetable decides is the end of the day: the return sailing sets a hard edge, and everything you do has to fit before it. Check the operators for the day you travel, because sailings change with the season.

Distance is not the problem. The island runs about 19 km end to end and no beach is far from another. The difficulty is that Formentera works on light and water rather than on kilometres. The best swimming is early and late, the lagoons are calmest at dawn, and the lighthouses at Cap de Barbaria and La Mola are at their best in the evening. A day trip touches the middle of the day and leaves before the rest.

What one day covers

A realistic day looks like this. Land at La Savina, take the bus or collect a bicycle, and ride towards Es Pujols before continuing to the north beaches around Ses Illetes, where the water is shallow and clear over posidonia. Swim, eat, move once more, and turn back. That is a good day, and it is the day most visitors have. It is also why so many people leave thinking they have seen the island.

Even a generous day trip tends to fold into one line. The north beaches and the lagoons take a morning. La Mola and its lighthouse take another. Cap de Barbaria and Cala Saona sit at the far south-west and ask for a third. Choose two and you have a full day; choose three and you spend much of it on a bicycle seat or in a bus, watching the island go past.

What you miss by leaving

The boats back to Ibiza run through the afternoon and thin out towards evening. Check the operators for the last sailing, because it varies with the season and the day of the week. Whatever the hour, it comes before the part of the day when the island settles. The day visitors go, the light drops, and beaches that were crowded at noon empty within an hour, whatever the month.

That hour is the point of staying. Cap de Barbaria takes the last of the sun; Cala Saona faces west and fills in the evening; the boat houses at Es Caló turn silver. Dinner comes late and unhurried. The next morning, before the first ferry arrives, Estany des Peix is still and the lagoons belong to the birds and a few walkers with binoculars. None of it fits inside a day trip.

• Evening lightThe western capes and Cala Saona are at their best once the day boats have gone.
• Sunrise waterSes Illetes and the lagoons are calmest before the first ferry arrives mid-morning.
• Late dinnerEating late is normal here, and a day trip never reaches the table.
• Market daysEl Pilar de la Mola holds its market in season; check current days before planning around it.
• Night skyWith low buildings and few lights, the sky is worth staying up for.

Two nights, another island

One night gives you an evening and a morning, which is the minimum for a sunset at Cap de Barbaria and an early swim at Ses Illetes on the same trip. Two nights give a full day in between, so the island can be taken in two halves rather than one line: the north beaches and the lagoons on one day, La Mola and the south-west on another. Three nights adds the patience to do very little at all.

There is a second effect that is harder to plan. Stays change pace. With a ferry to catch, every hour has a purpose and the day is a list; with two nights, an afternoon can be spent doing very little at Es Caló or under the pines at Platja de Migjorn, which is closer to how the island is used by the people who live on it and by those who return every year.

A day trip shows you the water. A night shows you the island after the boats go.

Basing in Es Pujols

Es Pujols sits on the north coast, roughly between La Savina and the road out to La Mola. It has the densest concentration of places to sleep and eat outside Sant Francesc, and it puts Ses Illetes, the two lagoons and the port within easy reach. In season it is the busiest village on the island, and that is the trade-off for being able to walk to dinner and to the water.

Out of season the calculation changes. Much of the tourist business closes roughly from November to April, and Es Pujols goes quieter than Sant Francesc or La Savina, which stay open year-round. Anyone travelling in winter is better based in Sant Francesc and treating Es Pujols as a walk on the sand. Expect closures, plan around them, and check what is open before committing to a week in the low season.

• Walk to waterThe beach at Es Pujols is at the end of the street, which matters after a late dinner.
• Ses IlletesThe north beaches are a short ride away, best reached early or late.
• The lagoonsEstany Pudent and Estany des Peix are close enough for a morning walk.
• Two coastsPlatja de Migjorn on the south side is a short ride for a different sea.
• Winter baseFrom November to April, Sant Francesc and La Savina are the surer places to stay.

Getting about without a car

Formentera is flat and short, and the signposted green routes (circuits verds) make walking and cycling practical between villages and beaches. A bicycle covers the distances without much effort and without a car. The island runs about 19 km end to end, which is a half-day ride at an easy pace and rather less if you stop to swim. Buses link the main settlements; services are more frequent in season and thinner in winter, so check the island bus operator for the days you are there.

A car is not necessary and, in high season, is a complication. The Consell de Formentera caps the number of visitor vehicles in summer, and the rules apply to cars brought over on the ferry as well as to rentals on the island. Check the current limits with the Consell before booking anything with four wheels. Most stays of two or three nights are simpler on two wheels, on the green routes or on foot.

When the island empties

The island has two edges to the season. May and June bring warm water and long days before the school holidays; September and October bring the sea at its warmest and a calmer version of the same beaches. As a guide, the sea is typically about 18-19 °C in May, 25-26 °C in August and 23-25 °C in September, which matters if you plan to swim rather than sit. These are typical values, not a forecast.

Winter is a different island. Ferries are fewer, many businesses close roughly from November to April, and the places that stay open are the main villages: Sant Francesc, La Savina and a handful of others. What you lose in choice you gain in quiet. The green routes empty, the lagoons fill with birds, and the low light on the water is the reason some people come at this time of year at all.

• Shoulder seasonsMay, June, September and October give warm water with fewer people.
• AugustThe busiest month; book beds and crossings well ahead.
• WinterFewer sailings and many closures; the island is quiet and the walking is good.
• Day lengthLong evenings in June, early dusk by November; plan the lighthouses around it.

Arriving and travelling light

Formentera has no airport. You fly to Ibiza (IBZ) and take a ferry from Ibiza Town port to La Savina: fast ferries take about 30-35 minutes and conventional ferries about an hour. Sailings are frequent in season and fewer in winter, so check the operators for the day you travel. From the airport, allow time for the transfer into Ibiza Town before the crossing, particularly in summer traffic. The island is small; the journey to it is the long part.

Pack for a small island. One bag makes the ferry, the bus and the bicycle all simpler, and there is little you need that cannot be found in Sant Francesc. Bring water, sun protection and a layer for the wind on the capes, and leave the car behind if you can. Travelling lightly here is less an ethic than a practical advantage: the island rewards people who move without much.

Leave the island as you found it

The clear water around Formentera is posidonia oceanica, a seagrass found only in the Mediterranean and the reason the sand stays white and the water stays blue. The meadows between Ibiza and Formentera are part of the UNESCO World Heritage listing. Anchoring over them is regulated under a Balearic decree, and mooring buoys are installed in some bays in summer. Check the rules and the buoy fields before you anchor.

On land, the small things add up. The green routes keep bicycles off the dunes; the dunes and juniper hold the coast together; the lagoons in Ses Salines Natural Park are for looking at, not walking through. The Pitiusan wall lizard lives here and nowhere else, so leave the stones where they are. Staying a night or two and moving slowly does less damage than a fast loop of the island.