i went 3am after work, and then 3pm the next day before work, I work 10pm-2:30 am, everday except friday.
the night after work I didnt hit the dunes, I hit a spot where people off-road there trucks and stuff, its seriously like 5 mins from my house behind this factory.
The place with the dunes, is about a 15-20min drive, but worth it, its a huge huge open area with some decent dunes, and huge trails, and open flat out dirt spots, it has something for everyone.
I live about an hour south of chicago, in bradley (the chicago bears practice here for summer training)
(kankakee county), its a pretty huge county, I just happen to know where people opened up some spots to ride.