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
Begin by killing any important character such as Joshua Graham or Daniel. Then travel to White Bird's Cave to retrieve the Zion Canyon Map (the map is in a clay pot northwest of the cave entrance).

Travel to the Southern passage. Then you can finally travel back to the Mojave Wasteland.