I read your title and was wondering what a "One Way Mountain Bike" was. I was envisioning the rides where they drive you to the top of the mounain and you coast down!
Sounds like some neat areas, all right.
I don't know about your specific area, but there are places out west where the Bureau of Land Reclamation owns lots of land that is more or less unused. You might check into that, and if that is BLM land or other public land, it may be just fine to be there, and would save you from a possible trespassing issue.
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"be careful this rando stuff is addictive and dan's the 'pusher'."