summitpost.org:

Ptarmigan Peak

Elevation: 12, 498 ft

Roundtrip Length: 12.0 miles

Start Elevation: 9.155 ft

Elevation Gain: 3300 ft

Ptarmigan Peak (12,498') straddles the border between Summit and Grand Counties, offering 360 degree views of every mountain range located within the Dillon Ranger District. The summits positioned within the Ptarmigan Peak Wilderness adjacent to its sister area, the Eagles Nest Wilderness but just 1/6 its size.

http://www.elcaminodelavaca.org

Russell Corfman posted the route:

The Black Canyon National Recreation Trail, or BCT, is a ~75 mile trail running North to South from the Prescott National Forest Boundary to the Carefree Highway. The trail is a multi-use pathway for hikers, cyclists, and equestrians. The trail follows ancient Indian pathways, Sheep herding migration paths, and stage coach routes. The trail was designated as a National Recreation Trail in 2008. There are two loops along the trail, so travelling end to end is about 75 miles.

This is a 30 mile loop in Big Bend National Park.

https://www.nps.gov/bibe/planyourvisit/bc_outermountainloop.htm

Difficulty: Strenuous; significant elevation changes and primitive trail
Distance: 30 miles (side-trips to the South Rim or Emory peak add up to five additional miles).
Time: Allow at least three days