CMH is a great city to fly from
I've lived in CMH for about (7) years and have flown NWA as my primary carrier. Because there is no dominant airline (market share) prices for flights starting/ending in CMH are very inexpensive.
As far as things to do, late at night, you might look into going to the
Easton Mall, but after 1:00 Am I don't know where you will go......
Good Luck!
RC