Harut, we ONLY stick to established trails that are legal to drive on, have signs and marks, and never venture anywhere off the trail. There are plenty of legal trails in moab that people have used for decades with well established routes and maps. Some of them go through private land and you have to pay a fee. Most of them are on public lands.
They all have signs indicating whether it's ok for Jeep, ATV, mountain bike, or just for hiking.
And as far as hardcore tree-hugging hippie environmentalists ... they can go flock themselves.