The 3-day ride to Porto up the coast mostly followed a designated cycling route that's part of the EuroVelo network.  I've crossed paths with more people touring than on any other trip.  Germans, Austrians (finishing a 3-year trip!), Dutch and 3 Canadians (all angry with the US), but none from the US.  There's been some very good infrastructure and the Europeans say it's even better further north. The EuroVelo route uses many pedestrian-oriented paths, some along beaches that are unrideable.  Lots of road alternatives, usually low traffic. I visited Obidos (cool hilltop medieval walled town) Overrun with tourists... And Nazaré, a beach town famous for big wave surfing and dried fish apparently. They were gearing up for a religious procession, likely related to a Fatima pilgrimage. Fishing heritage is well-represented. Always fun to see... ...