I'm in Roswell & haven't found any around here. Me & a buddy are (slowly) making a small track in his back yard (east Cobb county).
I've dropped by Noonday Creek park a couple of times because they have a bmx track but it is VERY popular for the bmx crowd and I kinda hate to encroach on them unless it's empty.
So, in summary- HECK YEA I want to find somewhere to bash!
And oh yea- when I've been by there, one-third of the soccer fields have been empty.
If you want to see how fast your truck will go on flat ground, the grass is usually cut very low.
You can just completely wind it up and watch er go!