This is a lovely place. It is a coast with a very recommended promenade. Extraordinary food. For lovers of the south they have large and good waves and good southern schools. The castle that is in the photo is gorgeous.
At the mouth of the Douro there's a beach called Praia do Titan, it's in Matosinhos and can be easily reached by metro. The beach is very nice and well maintained, if dirty. Besides the beach and the dam, there's a walkway that runs