BeaveRun Motorsports Complex
. It's a pay to play place, but lots of nice trails.
They have them seperated into Level 1, 2 & 3.
Near that is Mines and Meadows
for ATV's & dirtbikes.
Just don't take Jeeps/trucks onto M&M's trails or bikes/quads to BeaveRun.
Although, there was some talk of them getting together, but not yet.