http://www.sammysgrill.com/our-menus.html
I'd leave Biloxi earlier and try to get to Baton Rouge by lunchtime -- find a place to eat, and then head to the stadium area. Parking does suck....
Sammy's is a great place to eat....it's a heavy LSU-fan hangout place....so, keep that in mind.....but (to me) the food is consistent and excellent.....if you want a taste of Cajun/New Orleans -- (it's a nice blend of the two). It's on Highland -- so you are only about a mile or so from Campus....
As you go west on I-10 -- make sure you go to I-12 -- toward Baton Rouge (and not stay on I-10 through New Orleans)....Once in Baton Rouge, get back on I-10 East - exit at Bluebonnet ..... take that to Highland -- and let your GPS direct you from there (I think it's a right, onto Highland, but not sure).....
The grilled shrimp po-boy is pretty impressive....