The key to a good first date plan is usually a safe place (coffee shop, bar, frequented park, etc), easy out (no obligation to stay like for dinner or to the end of an activity), and something fun.

One that was a go to in summer was b'more licks and walk around Patterson park in the summer, sandlot bar (oitdoors) in good weather, or a cute coffeeshop downtown in fells like pitango