Ethan Kennedy submitted the route:

The Feldtmann Loop is a popular hiking loop on Isle Royale National Park. The Loop includes part of the Greenstone Ridge Trail, the Island Mine Trail, the Feldtmann Ridge Trail, and the Feldtmann Lake Trail. The distance is 30 miles. 

Christopher M. Smith established this route, which runs the length of the Niagara River between Lake Erie and Lake Ontario, with some "rules":

This course, with its essential elements, has been selected to: maximize the use of trails, follow close to the river’s edge, view Niagara Falls, and interact with features of the river landscape, hence the bridge crossings and descents into the gorge.