Some fire roads with a good amount of single track coming off of them. The ride up to the top of Noon Hill is challenging and the ride down is technical. Trails are marked pretty well and you can get a trail map where you park. Pretty fun place to ride.
Just west of Medfield center (if your coming from Medfield) take a left onto Causeway St. It's right across from the cemetery... Go a couple of miles on this road, you will cross over a swampy marsh area and take a left on a dirt road called Noon Hill Rd. parking isn't too far up on your right.
http://www.singletracks.com/item.php?c=1&i=5454