The week kicks off in a dramatic moonscape and recreation area in northern Wyoming's public lands. I continue northeast through Ten Sleep where I stop for pizza, and then venture into the sprawling Bighorn Mountains. I explore a lookout tower, savor the golden aspens, and then continue east into Black Hills National Forest, my first visit to South Dakota. After acquainting myself with the routes and tracks in the area, I wrap up the week in the mountain town of Custer.