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Idahofag reporting: Our state is mostly "public" land owned by the Bureau of Land Management or the US Forest Service. With the exception of a few regulated zones, I can camp out anywhere I want, ride a bicycle, hike, ride a horse or motorcycle, shoot a gun, practice archery, etc, as long as I don't start a range or forest fire. In designated "Wilderness" Areas I need a permit to enter, can't bring a bike or anything motorized, but I can go wherever I want in those places as well and set up camp. Some high mountain areas have fire restrictions, which is basically the main regulation to pay attention to, plus you need to keep your dog on a leash (I don't have one). Pic related. Technically, most of Idaho is owned by the US Federal Government, hardly any of it is "Idaho."
BTW I hate "National Parks," basically pre-packaged, paved, privatized human zoos. They are not "natural" in any way, managed to the point of having paved trails in some areas. They are over-run with tourists from all over the world. My advice to anyone visiting this country is that the "National Parks" might have some nice scenery, but you need to explore around different areas to see the real American outdoors.