It depends on the person...
But I would take someone into Baltimore, feed them breakfast at the Admiral Fell Inn. Then we would cruise the local record/thrift stores to kill some time. Since drugs can be purchased five blocks from Fell's Point that would be a possibility.
Then we would either get pizza from this one place also on fell's point or eat lunch at the rusty scupper since it is right by the visionary arts museum. After lunch we would go there and check out all the art. Then we would have some drinks and look out that window at that perfect harbor view...
Then I don't know. Check out a show playing that night, there is usually some decent bands on the weekends. There are a bunch of clubs that I have never been to but lots of people seem to swear by them. I guess dinner would depend on what was eaten for lunch. Someone visiting Maryland would probably expect to eat some kind of crab, and really there are so many damn places here for that I wouldn't even know where to start.
But if someone wanted to go the more tourist-y route I guess I would take them to Fort McHenry or just go to DC instead. The mall district in DC can be very beautiful in the spring, there are cherry blossoms and green lawns and pristine gardens... plus there are about a hundred different monuments and memorials, not to mention the smithsonian museums, the national art gallery, etc.
like I say it depends on the person.