It is Carnegie OHV. It is a Cali state park 15min from my house. That is what it looks like all summer, during the fall and winter it is all green grass. There is evreything from fire roads to single track. There is a kiddie track, atv track, and m/x track for just bikes.
Across the valley there is several test sites for Livermore Labs. every once in a while while parked out there you will hear the explosions. All of those sites are pretty heavily guarded.