The 7 best day trips south of the Tejo, ranked

Four ways across the river, and what each one costs

The ferry from Cais do Sodré to Cacilhas takes ten minutes and costs about €1.55 with a Navegante card; boats run every 10-20 minutes from before dawn until past midnight. From Belém, a ferry crosses to Trafaria for the Caparica buses. From Terreiro do Paço, catamarans reach Barreiro and Montijo. And the Fertagus train runs under the 25 de Abril bridge from Roma-Areeiro and Entrecampos down to Setúbal in around 55 minutes for roughly €4.50 each way — the single most useful line for day trips on this list.

By car, the Ponte 25 de Abril feeds the A2 south and tolls about €2; the Vasco da Gama bridge on the A12 costs around €3 and serves the estuary reserve and Alcochete. Both queue badly on Friday evenings and Sunday returns, so time your drive for mid-morning out and before 17:00 back. Buses from Praça de Espanha and Sete Rios cover Sesimbra and Setúbal for €4-6. Almost nothing here needs an organised tour, and the two that benefit from one — the dolphin boats and the Arrábida wine estates — you can book directly.

1. Serra da Arrábida and Azeitão — limestone, Moscatel and the best drive near Lisbon

An hour south by car, the Arrábida ridge drops from 500 metres of scrub and cork oak straight into turquoise water, and the N379-1 along the top is the best half hour of driving within reach of Lisbon. Stop at the miradouros above Portinho, look down on the Convento da Arrábida clinging to the slope, then descend for a swim. In Vila Nogueira de Azeitão, the José Maria da Fonseca house has been making Moscatel de Setúbal since 1834; tours with tastings run roughly €12-20 and take an hour.

Add Azeitão's other two edibles: the soft sheep's cheese, sold at the roadside from about €10 a piece, and the tortas de Azeitão, rolled egg-and-cinnamon sponges eaten with coffee. Lunch on grilled fish at Portinho for €25-35. This is the top of the ranking because it stacks a scenic drive, a swim, a winery and a village into one day. The catch is absolute: without a car it collapses into a bus-and-taxi puzzle, and in peak summer the coast road is capacity-controlled with a park-and-ride from Setúbal.

2. Setúbal and dolphins on the Sado — the best trip you can do by train

Fertagus from Entrecampos, about 55 minutes and €4.50, drops you a walk from the Mercado do Livramento, whose tiled panels of fishing scenes sit above one of the finest fish counters in Portugal — go before 13:00. Then eat choco frito, fried cuttlefish strips, at a market-side tasca for €12-16; Setúbal claims the dish and defends it. The old town's pedestrian streets and the Igreja de Jesus, an early Manueline church with twisted stone columns, fill an easy morning.

The afternoon is the resident bottlenose dolphin population in the Sado estuary. Operators run three-hour boat trips from the marina for roughly €35-45, with sightings common but never guaranteed; morning departures are calmer. If you would rather not board a boat, take the small ferry across to the Tróia peninsula for €7-9 return and walk empty sand. Setúbal is the strongest car-free day here and works even in shoulder season, when Arrábida's beaches are cold but the market and the church are unaffected.

3. Sesimbra and Cabo Espichel — fishing port, castle, and dinosaur footprints

A 40-minute drive or an hour by bus from Praça de Espanha, Sesimbra sits in a south-facing bay with a Moorish castle on the hill above and a fleet that still lands swordfish and octopus. Lunch is the reason to come: fish grilled on the beachfront for €20-30, or a plate of espetada of monkfish. The bay is sheltered, so it is calm when the western Atlantic is howling, and the water is a couple of degrees warmer than anywhere near Cascais.

Then drive 10 km west to Cabo Espichel, a bleak headland where an abandoned eighteenth-century pilgrimage complex frames a sanctuary above 100-metre cliffs. Dinosaur footprints are visible on the sloping rock faces below — the site is genuinely one of Europe's better trackways. There is almost nothing there: no café, no shop, a lot of wind. That emptiness is the appeal after a summer in central Lisbon. Combine both and you have a full day; add the castle for a fourth stop only if you drove.

4. Cacilhas and Almada — the best half-day, and the view back at Lisbon

Ten minutes on the ferry for €1.55 and you are in Cacilhas, looking back at a city that suddenly makes sense as a whole: the castle, the cathedral, the bridge, the river's real width. Turn left along Rua do Ginjal, the crumbling warehouse quay, and walk fifteen minutes to the restaurants built out over the water — Ponto Final is the famous one and needs booking weeks ahead, but the neighbours serve similar grilled fish at €20-30 with the same view.

Add the Cristo Rei statue on the cliff above: a lift to the platform costs around €6 and gives the single best panorama of the bridge and the estuary, better than any miradouro on the Lisbon side. Reach it by bus 101 from the ferry terminal or a €7 taxi. Total cost for the afternoon, ferry and lift and a beer, under €15. This is the trip to do on your first evening, when jet lag rules out anything longer and sunset is at 20:00.

5. Palmela — a castle you can walk into and wine you can drive between

Twenty minutes past Setúbal, the castle at Palmela crowns a ridge with 360-degree views over the Sado estuary, the Arrábida hills and, on clear days, back to Lisbon. The keep is free to climb to the walls and the pousada inside the old monastery serves lunch to non-residents. This is wine country — the Setúbal peninsula is one of Portugal's serious regions for Castelão reds and Moscatel — and several estates on the roads around Palmela and Fernando Pó take visitors for tastings at €10-20.

It is fifth rather than higher because it needs a car and it is a supporting act: three hours is plenty, and most people fold it into an Arrábida or Setúbal day. Go in early September for the harvest, or at the end of June for the Festa das Vindimas. If you are drinking at estates, nominate a driver honestly — the Portuguese limit is 0.5 g/l and enforcement on the A2 is real. The Fertagus train reaches Palmela station, but the castle is a stiff uphill from it.

6. The Tejo estuary reserve — flamingos, storks and 30,000 birds

Across the Vasco da Gama bridge, the Reserva Natural do Estuário do Tejo protects one of Europe's most important wetlands: mudflats, salt pans and rice fields around Alcochete and Ponta da Erva that hold tens of thousands of wintering waders. Flamingos are present in numbers from autumn through spring, along with avocets, black-tailed godwits and spoonbills. White storks nest on pylons all along the road. Local guides run half-day birding trips for roughly €35-55, which is worth it because the best hides need permits and local knowledge.

Do it between October and March, when the numbers peak and the temperature makes walking pleasant; midsummer is hot, still and comparatively empty of birds. It needs a car, an early start and the tide tables — birds concentrate on the falling tide. Alcochete itself is a pleasant small town for lunch, with sardines and estuary fish at modest prices. This ranks sixth only because it is a specialist day; if you own binoculars it comfortably beats half the list above it.

7. Comporta and the rice country — and what to skip

Ninety minutes down the A2 past cork forests, then a landscape of rice paddies, storks and dunes, with white-and-blue fishermen's houses and beaches that run uninterrupted for tens of kilometres. Lunch at a beach restaurant is €45-60 a head; a lounger at a beach club is €18-25. Come on a weekday, out of August, and it is genuinely lovely. Come on an August Saturday and you queue for the bridge both ways for a stretch of sand no better than Arrábida's.

What to skip on this side of the river: Barreiro and Montijo, which are commuter towns with nothing for a visitor beyond the crossing itself; the Costa da Caparica town front on a summer Sunday, when the southern suburbs arrive en masse; and any tour selling "Arrábida and Sesimbra" as a four-hour coach trip, which delivers two photo stops and no swim. If you have a single day south of the river and a car, spend it on Arrábida. If you have no car, spend it on Setúbal.