The trails are the Gould Academy Race courses but are open to the public as well. The trails are maintained and new sections have been added very recently.
From the Bethel Village go down Mill Hill Rd. straight across the intersection onto Grover Hill Rd. At the to of the very frist hill you will see two parking lots on on each side. Park your car and get you bikes out. There is single track on both sides, On the Right side follow the blue red and yellow arrows and it will be a loop. On the left you go in and you will see the end of the track go past that and farther down the clearing and on your left there is a entrance and you can go in that to get the whole loop.
http://www.singletracks.com/item.php?c=1&i=5600