We played a few times just up US60 about a mile West of the Arboretum. The games went well and we even got a visit from a Forest Ranger who said she was cool with what we were doing.
Picketpost Warrior AO is Suoth of US 60 and about a mile and 1/2 from Picketpost Mountain. Still good to play, but it's too damn hot this time of year.
Game field.. oh, maybe 1000 acres of open desert, lotsa cactus, but neat terrain.
Chip