I was in Oporto just for a day, as a stop in a cruise. I was enchanted with the city but didnt have much time to explore. I'm now planning to fly there next year and I'm trying to decide if 3 nights is too many? Would appreciate any "must sees" recommendations. After I'll make my way to Tui, Galicia, where I'm planning to start walking the last segment of the Camino Portugués to Santiago.
Thank you in advance for any help