Depends on when you're in town, but I would highly suggest going to Max's Taphouse in Fell's Point. Best selection of beer I've seen in the city. Also, any of the other bars in the Fell's Point and/or Federal Hill area are fairly decent. Those are the two "drinking" districts inside the city.
If you're going to be in the weekend of the 19th - we're having a brewday a few miles north of the city and you're welcome to attend and drink and be merry. Otherwise, pending what my schedule looks like once we get to June - I'd be happy to get together and bring some homebrew/mead/whatever or just get together and share a pint or two.