For regular tourist there are some historic buildings to visit. But the most interesting, in my opinion, is an aqueduct. I always thought of aqueducts as part of ancient heritage. But that structure was constructed in early 18th century (1705-1714). It was a big surprise to me. It is the second longest aqueduct in Portugal. It transports water from a spring in Terroso / Povoa de Varzim to a fountain in the monastery of St. Clare.
Portugal's official tourist portal visitportugal.com, points out to the tradition of making lace. You can find more information about it at the Lace Museum. Somehow we did not make for it, but the aqueduct is worth seeing.