Wine tour in Porto Portugal

My pal from CA got back from Porto just yesterday. He and his wife had a wonderful time.
He recommends this place:
https://www.grahams-port.com/visits-tastings

Also, when you're in Porto, be sure to do this:

(From Google:) The Dom Luís I Bridge crossing on the Yellow Line (Line D) is the most iconic tunnel exit on the Porto Metro. Traveling southbound from the subterranean São Bento station, the train climbs steeply, exits a short tunnel, and immediately bursts onto the top deck of the bridge, offering sweeping views of the Douro River, Ribeira, and Vila Nova de Gaia.

Thanks so much. Saw Graham’s and sounds like a good one. Will definitely try the metro ride to the Douro!

There are many Port Lodges on the Gaia side of the river. You can simply walk around and go in the ones that look interesting. Some of the bigger ones can be reserved. Graham’s is likely one of those. But, I find the smaller ones a bit more interesting and less commercial. I have great memories of an afternoon getting very tipsy doing just that but with regular wine - not port.