There are numerous local parks within Champaign/Urbana and in surrounding areas that contain hills suitable for wintertime sledding.
Location: Corner of Kenwood & Kirby, Champaign, IL
University of Illinois Arboretum
Location: South Orchard St., Urbana, IL
This park has a large bowl-shaped hill. You can slide off either side (into the bowl or off the back of it).
A popular destination for university students to sled.