We have about 4 riding "parks" within 30 miles or so where we can camp and ride. (one 6 miles away in the forest)
It cost 3 bucks for the day, and when the kids were young we would take them to those, because they have marked and maintained trails.
Now that they are older we can take off about anywhere.
OHV registration is about 25 per bike, and another 3 bucks for street legal.
There are hundreds of trails within 10 miles of us that go on for days if you wanted to.
Some of them just NASTY tough, and I remember one recently that took us two hours to get 3 miles on it.
One of them was when one of my riding buddy's got a new KTM 300 two stroke and he couldn't follow me on my XR. (Hence the name "TrailBeast")
That's what my friends called my bike. :-)
It's a Honda 500cc air cooled four stroke with a CR 500 front end and disc brakes.
That is his brand new KTM that you can barely see laying down in the ditch behind me. :-)
That is called "Iron Man Trail" and pictures don't come close to showing the actual difficulty of it.