Most of this trail will have you going either up or downhill, although it's a gentle gradient that only adds up to 600 or so feet of elevation gain. You'll cross a couple of roads and share a section of the path with horseback riders. The trail is a good, short introduction to hiking at JMF.
Starting at the campground parking lot you start down Mitchell Hill trail. From the parking lot head across the field on the West towards the gate. Take a right past the gate down the dirt road a few hundred feet before turning left onto the trail. Follow signs for Mitchell Hill/Welcome Center before veering off onto the Yost Ridge Trail , which is marked and easily distinguished by a small set of stone steps. From there it's easy to follow the path until it seemingly ends at the end of a road. Follow this road up about a hundred yards and then looks for a path back up into the woods where you'll meet back up with the trail and go back the way you came.