south fork dirt riders in taylorville has trails, unfortunately the hills out there aren't anything awesome which is what most of us trail guys really love to ride!
here's some other places that i hit in illinois any chance i get
lincoln trail motosports in casey, IL - lincolntrailmotosports.com
mill creek which is near Marshall IL - clarkcountyparkdistrict.com
little egypt offroad near Marion IL - southern illinois riding and this is probably the best place in illinois
badlands is also worth the drive, it's in indiana and has a little bit of everything. dunes, woods, mx track, etc.