I have been riding serious for over 10 years. I am 28 years old, my career as a personal trainer pushes me further to appreciate mountain biking. I have been to a decent amount of trails, including MOAB out west, and the famous Crested Butte, Colorado. I live very local to the Skylands Manor. I love it here in New Jersey. I know some other good riding not far, in New York. Ringwood by far is the hottest, roughest trail. If you like difficult climbs, tricky obstacles, including riding across fallen trees, 5 feet in the air, 25 feet long, this is the place for you.
I ride a hard tail bike, front suspension of course. ANY bike shop in New Jersey is familiar with Ringwood riding. There are many for than 10 miles of trails here, but the 10-mile singletrack loop is plenty enough. After about 8 mikes, your legs are pretty shot.