While you're in Santa Marinha, take in top sights like Gaia Cable Car and jump on the metro at Jardim do Morro Station to see more of the city.
While visiting Canidelo, you might make a stop by sights like Lavadores Beach and Local Nature Reserve of Douro Estuary.
While visiting Oliveira do Douro, you might make a stop by sights like Duoro River and Real Companhia Velha Cellars.
When in Madalena, you can plan a visit to Lavadores Beach and Ribeira Square, some noteworthy sights in the nearby area.
If you're spending time in Mafamude, check out sights like El Corte Inglés de Gaia or Teixeira Lopes House Museum and hop on the metro to see more of the city at João de Deus Station or Câmara de Gaia Station.