In Oporto, Portugal, you can take a river cruz if you want. There are several choices from 50 minute boat tours to several hours or even several days.
I chose to go on the 50 minute "Six Bridges" river cruise. I started at the Cais da Ribeira where you purchase your ticket and board the boat. We passed under the six bridges of Oporto on a relaxing tour and took in the glorious view of the World Heritage site of Oporto up on the hills. The wine cellars of Vila Nova de Gaia were spread out on the opposite side of the river. The views were magnificent of many old historic buildings and old cathedrals and churches. At the mouth of the Douro, we viewed the waters beyond known as the "land of the fishermen".
The Douro River is a beautiful river that sparkles under the azure sky as the sun shines down on its pristine waters.
I was rewarded with a serene and happy feeling as I disembarked from my short cruise.
I definitely recommend cruising the Douro while in Oporto. The difficult part is choosing which boat cruise to enjoy. Of course, it depends on how long you are staying in Oporto. Plan ahead, of course, and work this adventure into your trip. You will be glad that you didn't miss it.