I just picked up a 2000 KX250 this week. I have had several street and dirt bikes in the past but its been about 8 years since I rode in the dirt. I looking forward to doing some trail riding.
Center road MX is a good place near Yadkinville.
Catfish pond in VA near Martinsville is a large place w/many miles of trails.
Thunder valley, also near Yadkinville is good also. Not sure if they are still open, it's been awhile since I was there.