"What type of riding is there,ie, degree of difficulty,terrain,etc?Is it worth the drive from Chicago? "
There is a little of everything there. Hills, rocks, roots, open trails, tight singletrack, soil drains off very quickly after rain. The camping area has plenty of spots for over 800 riders and has bathing facilities. They also have a small country store that has general food items, ice and whatnot. The closest town is about 5 miles and has hotels, a few fast food places and a couple gas stations/markets.
There are only a couple times a year that riders are allowed at Loretta Lynn's. The VSTA fall ride, the MTDR spring ride, the GNCC race and if you qualify, the amatuer motocross championships. If you like to ride, you will love this place.