Pretty much anywhere in the actual Forest is up for grabs. You're not allowed to camp in or near recreational areas, like picnic areas, trailheads, campgrounds, etc. You also have to camp at least 100 feet away from streams or any water source. There are rules you'll have to follow, but the sky's the limit when picking a spot to camp. You're allowed to stay in the same campsite up to 30 days maximum; then you have to move at least 5 miles from that spot.