The Lake Dunn Trail's northern trailhead is at the Lake Dunn Dam and also accessible from the park's campground. Or via a connecting hike/bike trail from the Visitors' Center parking lot.
The 2.77-mile one-way Lake Dunn Trail takes you on an easy walk around the shore before veering off into deep forest. Rather than backtrack, use connecting trails to form a rough 7-mile loop back to your starting point. If you don't mind sharing space with bikers and equestrians, veer east onto the park's multi-use trails and take one of the north-bound trails back through the woods to the banks of Lake Dunn. A full trail map is available on the park's website.