Gaia located south of the city of Porto on the other side of the Douro River. A hub of the port wine industry, Vila Nova de Gaia is peppered with cellars offering tours and tastings. The scenic riverside road Cais de Gaia, with its cafe terraces and expansive views across the Douro. It is worth taking the time to explore the alleys beyond the main strip along the riverfront. they offer an escape from the crowds but provide a change of scene with some interesting sights. The Douro is a spectacular river so you might be in the mood for something longer.