Nashville
Doesn't need to be walking distance. I work DT a lot. Plenty of huber, bicycles, trolley or MTA. I'm usually there for lunch time working and only dinner once and a while. For a burger go to Gabbys, Hotdogs Chicago Dogs and pizza Joey's. Or walk over to the Arcade between 4/5th there are several. Demo's is good food, Spaghetti Factory factory good too. There is plenty of places to keep ya occupied. Have fun.
PS. Lane Auto museum if their open, TN state museum 5th/Dederick and the Frist Center are a nice visit.