My general guidelines for off trail hiking are a mile or so across open sagebrush steppe, perhaps half a mile through open forests like ponderosa pine, and about a quarter mile for a western Douglas fir forest. This activation is a reminder to stay with these guidelines and not ever wander through a lava flow again.
I started from the Carson Guler Road, parking about 2.5 miles east of the gate for Red Mountain (W7W/LC-036 - a recommended activation).