Chaos in Zion

Chaos in Zion is a side quest in the Fallout: New Vegas add-on, Honest Hearts.

Quick walkthrough

 * Kill any quest character (Joshua Graham, Follows-Chalk, Waking Cloud, White Bird, or Daniel).
 * Retrieve the Zion Canyon map from the Sorrows Camp.
 * Return to the Mojave Wasteland.

Detailed walkthrough
The quest begins when the player kills any storyline-essential character: Follows-Chalk before reaching Graham, Joshua Graham himself or Daniel. He is then required to travel to White Bird's Cave to retrieve the Zion Canyon Map (the map is in a clay pot northwest of the cave entrance).

Last, the player has to travel back to the Southern passage, through which he can return to the Mojave.