CC BY-NC-ND “Associação de Turismo do Porto e Norte, AR”
Porto is a great travel destination with a lot to visit, but sometimes you need to get away and explore the surrounding areas (e.g., Douro valley, Gerês national park). 
The social program, with the support of the Porto Convention & Visitors Bureau (PCVB) and the Porto City Hall (Câmara Municipal do Porto), includes a boat tour that crosses the six bridges, followed by a visit to a Port Wine cellar. 
The boat tour that crosses the six bridges of Porto is the most popular attraction in the city. You can not lose! 
During the six bridges cruise, we will sail across the Douro from the Arrábida bridge, the longest in the city, located next to the mouth of the river, to the Freixo bridge, located at the eastern end of Porto. In addition to the previous ones, we will cross the Dom Luis I bridge (from the 19th century and with 385 meters, the most spectacular and well-known in Porto), the Infante Dom Enrique bridge (built in 2003), the Maria Pia bridge (designed by Théophile Seyrig, partner of Gustave Eiffel, in 1873) and the São João bridge (only for trains).
As man does not only live from bridges, you will also enjoy the best views of Porto and Vila Nova de Gaia, where the most famous Port wine cellars are located.
Oh, of course, we will sail aboard a rabelo, the traditional boat used to transport barrels from the vineyards of the Douro valley to the cellars of Vila Nova de Gaia. At the end of the 50-minute route through the Douro, we will return to the starting point.
Visiting the Port Wine Cellars is one of the most popular things to do in Porto and is therefore a unique activity that you cannot do anywhere else in the world!