This may be a bit touristy, but they provide a great deal of good information about the port industry. You do have to make a reservation to attend a tour. We made ours the morning of and had no problems. There is a "supreme" tasting option that gives you some more select ports to try. We didn't know about this, so missed out. I would ask in the future and do that. The cellars are beautiful and the history grand. The waiting area is a mini-museum.