I live in Chicago about 2 hours north of Champaign. I grew up in the Chicago suburbs. I've been to Champaign a few times, but not in the last 10 years.
I'm from central Illinois and I went to middle school in Urbana. Most of my immediate family lives in or around that area.
Urbana has an art house theater and Roger Ebert's "home theater" at the Virginia - an honest-to-god movie palace, complete with granitework and a pipe organ and a huge film festival every spring, art galleries and regular performances of live jazz and classical music thanks to the Art and Music programs at the University of Illinois. Because I grew up there, that's what I thought college campuses were like until I actually went to a college. There's also pretty decent art and natural history museums on campus. I remember really liking the children's science museum, even as an adult.
I can check with relatives as far as decent places to eat.
The bar entry age in Champaign county is 18, making it a destination for teenagers who want a taste of that life.
There are a number of nearby historical attractions, most of them related to Abraham Lincoln, railroads or the native Indian tribes of the region. If you're willing to drive a little, there's also Springfield (Lincoln, Lincoln, Lincoln) or Peoria (Caterpillar, Caterpillar, Caterpillar).