Actually, he's our nephew, but it's the same idea.
In a few weeks we will be visiting our nephew, a freshman at UW-Madison, for part of a day on a Sunday. We plan to take him out to eat, although we haven't yet decided what time we will get up there, so this could be for brunch, lunch, or dinner. Obviously it needs to be a place that's open on Sunday. Casual attire is a definite (knowing Madison, that probably doesn't eliminate much, especially since L'Etoile isn't open Sundays anyway). Proximity to the university campus is desirable. (I'm familiar with the downtown square immediately around the capitol, but not at all with the campus or the rest of town; I don't know if the downtown places are considered close, or if there are a bunch of other places closer to campus.) So much the better if it's a place that a university student would consider a real treat (which may be due to quality of food, special atmosphere, portion sizes, etc). I'm not aware of any specific preferences or requirements he may have regarding types of food, but AFAIK he's pretty open-minded. No sushi, please!
I've reviewed the two comprehensive discussions on Madison here (at www.chowhound.com/topics/125180 and www.chowhound.com/topics/418838 ) but haven't gotten far enough to know what places mentioned there might be (a) close to the university, (b) open Sundays, or (c) particularly impressive for a university student.