Are you a foodie? It doesnt get much better then the province of Emilia Romagna (Bologna, but also Parma, Modeno, but also any of the smaller towns have something worth your time).
Beerwise there is tons to do in Milan, you probably could stay busy there for a couple weeks. Bologna is good too. Italians are big on craft beer, any kind of city you visit would probably have some places. There are also nice places for Lambic, if you are into that kind of thing.
Bologna is a lovely place sight seeing wise. Milan is Ok, I dont really understand why so many tourists go there, it lacks the certain flair lots of other Italian cities have. Florence is very lovely too in that regard (not sure about beer, but as I said, I am sure there must be something). In Ferrara I only visited the castle, Verona has been a long time since I have been there, so I dont feel like I can comment on those.
Apart from beer, there is obviously a lot of wine in the region, but also not an expert on that