Things to Do in Porto

In short

Three days is right for Porto; a fourth belongs to the Douro valley, which is where the wine actually comes from.
The port cellars are not in Porto — they are in Vila Nova de Gaia, across the river, which is a different city.
Cross the Dom Luís I bridge on the upper deck, not the lower one: the upper deck carries the metro and pedestrians, and it has the view.
Porto is steep. The riverside and the cathedral are a hundred metres apart on the map and a serious climb apart in practice.

Three days covers Porto, and the fourth belongs to the Douro valley upriver. Two things are worth knowing before you arrive: the port cellars everyone comes for are across the river in Vila Nova de Gaia rather than in Porto itself, and the city is genuinely steep — the walk from the Ribeira up to the cathedral is a climb, not a stroll. Come in late spring or early autumn.

Two banks, one river, and a bridge to cross twice

Porto sits on the north bank of the Douro. The port lodges sit on the south bank, in a separate municipality called Vila Nova de Gaia. Almost every guide lists both without making the geography clear, and it is the thing that shapes a day here.

Ribeira — the old waterfront on the Porto side, all narrow houses and terraces facing the water.
Vila Nova de Gaia — the opposite bank, where every port house has its cellars and its tasting room.
Dom Luís I bridge — two decks. The upper carries the metro and pedestrians at the height of the cathedral; the lower carries cars at water level.
Jardim do Morro — the park at the Gaia end of the upper deck, and the place people watch the sun set over the city.

The practical version: cross on the upper deck going over, spend the afternoon in Gaia, and come back along the lower deck at water level. You get two entirely different views of the same river for the price of walking.

Port is a visit to Gaia, not a drink in Porto

The wine is made up the Douro valley and aged in Gaia, and the lodges have been doing tours in English for a century. It is the most organised thing in the city and the easiest to book badly.

The big names — Sandeman, Graham’s, Taylor’s, Cálem — run scheduled tours with tastings, and the popular slots go in advance in season.
Smaller houses take walk-ins more readily and give you more time with someone who knows the wine.
A tour is roughly an hour: cellar, explanation, two or three glasses. Two lodges in a day is plenty; three is a waste of the third.
If you only want to drink it rather than learn about it, the terrace bars along the Gaia waterfront pour the same wines with the view thrown in.

The old city is vertical

Porto is built on a slope that falls straight into the river, and the distance between two points on the map tells you very little about the effort between them.

São Bento station — the entrance hall is lined with twenty thousand azulejos, and it is free to walk into because it is a working station.
Sé do Porto — the fortress-like cathedral at the top of the hill, with a terrace looking back over the roofs.
Clérigos Tower — the tallest thing in the old city, and a narrow climb to the top.
Livraria Lello — the bookshop everyone photographs. It charges admission, the queue is often long, and inside it is very full of people photographing a staircase.

Livraria Lello is the one to be honest about: it is a beautiful room, it is also a ticketed queue for a shop the size of a large living room. If the line is round the corner, the tiled facades of Capela das Almas and Igreja do Carmo are free, outdoors, and take five minutes.

The Douro valley is the fourth day

The terraced vineyards upriver are where port actually comes from, and they are the reason to give Porto a fourth day rather than a third.

Day trips from Porto
Where	One way	What it needs
Douro valley (Peso da Régua)	2 hours by train	A full day. The train hugs the river for the last hour
Pinhão	2.5 hours by train	A full day. Smaller, deeper into the terraces
Guimarães	1 hour by train	A half day. The castle where Portugal began
Braga	1 hour by train	A half day. Churches, and the stairway at Bom Jesus

The train along the Douro is the point, not the transport. Sit on the right leaving Porto — the line runs beside the water for the last stretch and the view is on that side.

Common questions

Are 3 days in Porto enough?

Yes for the city — one day for the old centre and São Bento, one for Gaia and the port lodges, one loose. Add a fourth for the Douro valley, which needs a full day and is the reason the wine exists.

What should you not miss in Porto?

The upper deck of the Dom Luís I bridge, the azulejo hall at São Bento station, one port lodge tour in Gaia, and the view back at the city from Jardim do Morro at sunset.

Which is nicer, Porto or Lisbon?

Porto is smaller, denser and easier to cover in three days, and the river gives it a single dramatic centre. Lisbon is larger, more spread out across hills, and has more to do over a week. Porto is the better short trip.

Is Livraria Lello worth it?

It is a beautiful room and a ticketed queue for a very small shop. Worth it if you arrive early and the line is short; not worth an hour of a three-day trip. The tiled churches nearby are free and take five minutes.

What is Porto most famous for?

Port wine, which is aged across the river in Vila Nova de Gaia rather than in Porto itself, and the blue azulejo tilework on its churches and its main railway station.