7.2 miles (by combining the major trails within the park). Surface is dirt/roots, not that many rocks. Some minor hills.
Our two cents: Scenic, historic park that is more suited for easy or short hikes, but avid hikers can still get some miles in with the option to extend their hike even further by crossing into Ted Stiles Preserve/Baldpate Mountain.
While the network of trails makes it easy to shorten or lengthen the route as you go, these multiple junctions can also be a tad confusing.