I'm gonna reiterate what TP said and suggest The Chimes which is at the north gates of campus! Great Louisiana food and very extensive beer selection.
Going out, Friday night is the Abita Pub Crawl downtown from 5-10. $1 Abita beers the whole time. 3rd street is where you will find most of the downtown bars.
If you're looking to scam on LSU freshman, Reggies in Tigerland is the place to go. If you want to experience LSU bars w/ a slightly older crowd Fred's, JL's (who have free drinks 8-10 on Fridays), and Bogie's are prime choices.
For late night drunk food and/or breakfast, Louie's (which is right near the Chimes at the north gates of campus) is a great choice!!!
Enjoy your time in BR