The trail within the park starts in the northeast corner, passing the edge of the Cinder Cone and the Fantastic Lava Beds, then skirting Prospect Peak. Crossing Badger Flats and passing through the Devastated Area associated with the May 21, 1915 eruption of Lassen Peak. The trail parallels the Lassen Park Road, then passes between the Chaos Crags and Table Mountain, across Sunflower Flat and over Nobles Pass, following the edge of the Chaos Jumbles. The trail leaves the northwest corner of the park near Manzanita Lake.