(Some of these are in or near "sketchy" areas, but you'll be fine if you keep to your ps and Qs and mind your own.)

Depending on what part of the city you want to go to, there can be a lot to do and see. Out west, you have the Billie Holiday statue on Pennsylvania Ave. (go during the day, Penn is always wild), the Edgar Allen Poe House, Cylburn Arboretum by Pimlico Racetrack is nice; and some odds and ends historic sites. If you are a veteran or enjoy history, or would like to pay your respects to our veterans; I work at the Baltimore National Cemetery right on the line to Irvington and Catonsville (West Side) and it's a very nice place to see Civil War Era headstones and have a quiet place to reflect. In the city, we also maintain Civil War and Spanish American War sites at Loudon Park National Cemetery about 10 minutes away. There's also the B&O Railroad Museum, which is great if you enjoy transportation history.

Downtown has too much stuff to mention reliably, lol, but definitely do the aquarium and the Washington Monument (which was the original before the one in DC was made).

Around South Baltimore, you have many bars and trendy restaurants, and also Fort McHenry, where the National Anthem was written during the War or 1812.

Idk a lot about the East Side, but in Northeast Baltimore, Lake Montebello is a really nice place for a walk, and Big Bad Wolf on Harford Road has really good BBQ

There's so much to do in the city, much more than what I put on here, but if there's anything specific you're interested in, let me know, and I'll try to help.