A visit to Porto would not be complete without the Douro river. Paris has the Seine River, Porto has the Douro River ;)
Whether it is just sitting by the river, people watching, eating at a patio restaurant by the river, wine tasting – there’s always lots to do by the Douro River. (also, I don’t know about you, but watching the river flow is very relaxing… especially if you have been travelling for a while in Europe and have been on the go for a while!).
If you have the time, I recommend visiting the river during the day as well as at night.
Douro River during the day:
Douro river at night: