I think Kennesaw is a decent distance from Atlanta if you are planning a rush hour trip. And by rush hour, I mean 4 to 7.
Sweetwater Brewery is open from 5:30 to 7:30.
Atlantic Station is pretty straightforward and easy to roam around (although not a favorite of locals...but I enjoy it).
Midtown and Virginia Highlands have the bigger bar scenes. Maybe something like Park Tavern, Tin Lizzy's, or the Prickly Pear in Midtown.
Possibly Six Feet Under next to Oakland Cemetery. A rooftop bar overlooking an old cemetery. Go check out Bobby Jones's grave.
I think there is stuff in places like downtown Marietta, but I've never been. Marietta might be more convenient coming from Kennesaw.
I admit I haven't gone out a lot since I've lived here. So some of these might be terrible suggestions.
This post was edited on 2/19 at 12:54 pm