We had a great time biking Perkins Clearing between Indian Lake and Speculator off of Route 30 in New York. It used to be logging trails that is no longer in use and is great for biking. There are some campsites available in there also which are accessible by car. As these trails were for logging purposes, they are wide enough for a car and it is not single track riding. However, it does provide nice access into the Adirondack forests with views of streams, ponds, and mountains.
For Memorial Day weekend, we procrastinated so all campsites had been taken. So we found the campgrounds at Laguna Seca Recreational Area near Monterey, California was the only place available and decided to try it. It turned out to be quite the find for mountain bikers. The area includes 900 acres of single track biking going up and down some fun hills. At one point on the trail, I hit a sand pit at the bottom of the hill and got all tangled up trying to down shift, turn and crank the pedals. I did not get close to covering all the trails but during the entire 1 1/2 hour ride, I did not encounter another rider except for my riding buddy.