We made a short stop in Porto, the second largest city in Portugal next to Lisbon. Since this was not part of our official itinerary, we did not see much, except for the riverside quarter of Ribeira as we crossed Ponte Luis I. This area lies along the banks of the Douro River. Traditional boats floated at the quayside overlooked by colourful ancient houses and medieval streets, and lined by smoky bars and seafood restaurants. Across the river is Vila Nova de Gaia, where accor