Jason Fenton owns Halter's Cycles in Monmouth, New Jersey, a bike shop that opened in 1987 and admittedly stocks way more rigs than they need to so that customers have plenty of options. Since 2004, Fenton has been building and maintaining the trails at Six Mile Run Reservoir so that he and others have a good place nearby to ride. For an hour or so a day, he chainsaws and digs and rakes to bring an extra second or two of improved riding to his region. The above video by Adam Nawrot tells his story.
For more on Fenton, read Halter's blog.