OP here. I often wish that the OP would check back in (what DID you name your baby? did you file for divorce or not?!). This topic isn't as exciting as those examples, but thought I'd close the loop. We finalized plans to meet at the Maryland Zoo (thanks PP!) even though I was bummed it's practically the only zoo not to have reciprocity with FONZ. Right after we'd set the meeting time, etc., she made plans to meet up with a friend in Annapolis afterward. Since it's the same distance for each of us to drive to Baltimore as it is to drive to Annapolis, Baltimore no longer made sense.
I found Kinder Farm Park through Yelp. It was fantastic! Somewhat similar to Frying Pan Farm Park, for anyone who has been there, but with a huge multi-level playground aimed at younger kids. It was perfect! We got to see the animals, play on the playground, walk along the paved trail, and have a small picnic. If anyone is looking for a place not too far from Annapolis, I highly recommend it!!