Sorry, but I have to disagree with you on that. Maybe in Texas, where almost all the land is private, but in northern California and Nevada there are vast, and I mean vast, areas of Federal (Forest Service, BLM) land that have rarely, if ever been penetrated by man.
I can take you to several lakes in remote canyons not 20 miles from my house that are visited, and fished, maybe once a decade. Just because a road or trail goes through an area doesn't mean that people are out walking all over the territory.
Is hunting restricted in these areas?