The Millennium Trail is located in Bernheim Forest. The trail is the longest trail in the Forest. The trail features steep ascents and descents as well as multiple creek crossings. There are also lots of trees down.
WARNING to anyone who runs this: Paul, Mark, and I ALL missed the same turn. It's at 11.5 miles if you're running counterclockwise. I think it's right when you start seeing orange tape and begin that downhill (look at our GPS files for the exact location). Everything else is well marked - just follow the plastic yellow markers on the trees. At about 6.5 when you cross Ridgetop, they change to somewhat feint yellow dots on the trees instead of the much brighter plastic yellow arrows, but the paint markings only last for maybe a mile or so.