I know there have been multiple discussions on "things to do" in the Columbus area, try the search function at the top of the page.
In summary, though, there ain't a whole hell of a lot to do IN Columbus, but, the good news is that it is pretty centrally located for some good weekend road trip possibilities. Columbus itself has a few bars. Up the road about 40 min is Starkville, which is home to Mississippi State University. Couple more bars/college crowd (ie, frat boys with bushy hair and pink shirts with decent looking girls attached to their hips). Memphis, TN is about 2.5 hours away, Nashville is about 4.5 hours. New Orleans and Biloxi are about 4 four hours away.
A lot of people like to go out on the boat around here, and Columbus has a pretty big lake to go out on. Services has some barely-seaworthy vessels for you to rent, but they are always spoken for and you get put on a waiting list. Tuscaloosa is about an hour drive (home of the University of AL, again, decent bar scene) and Birmingham is about 2 hours away. Atlanta is about a 3.5-4 hour drive...
I think you get the point... Places around here for you and your bros to drink and hang out or have dinner. Other than that, save it for a weekend trip. Hope that helps, search for other posts/opinions as well.