Barlows,
Rockwall county has great FM road to ride. Hang a right on FM 740 once you cross the lake from 66 and stay on it after you cross I 30,that will take you into Heath and the other FM roads. Most of them will be hilly. I live in Royse City and FM 548 is a nice ride. Not a lot of traffic most of the time.
Ride Hot Rocks next Saturday if you can, It will give you a nice tour of Rockwall and the many backroads in the county.
Chris