High Noon at the Gulch

High Noon at the Gulch is a side quest in the Fallout 4 add-on Nuka-World.

Detailed walkthrough
Upon entering the Gulch, bloodworms will attack the player. After clearing them, speak to either Sheriff Hawk or Sheriff Eagle. They will instruct you to talk to three other robots in order to earn a combination to access the key. Each of the robots' quests can be surpassed with a red speech check or using the Robotics Expert perk.

The Giddyup Kid will ask you to track down his missing Giddyup Buttercups. A Giddyup Buttercup toy can be found directly to the east, shoved in a trash bin at the refreshment stand. Dropping it into the circle will gain you a code piece.

One-Eyed Ike challenges the player to a duel and gives them a Western revolver for the purpose. Once he says Draw! you must shoot him before he shoots you. If successful, you gain another code piece.

Doc Phosphate will ask you to deliver drinks to three patrons (which are skeletons). Take the drinks and place them on the tables next to each patron. Once outside, however, a variety of ground creatures will attack. Upon returning, Phosphate will offer to lodge a complaint for dead employees, and give you the third code piece.

The safe with the key is located inside the theater 'arena', in the middle barn. Enter Mad Mulligan's Minecart Coaster and deal with the source of the bloodworms inside: the bloodworm queen. A number of brahmin corpses lie about the cave, which will burst out bloodworm larvae when approached. Once the queen is dead, collect the medallion before you leave, in the souvenir shop behind the chained door.

Speaking to either sheriff will yield a reward of 200 caps - wearing the Silver Shroud costume and speaking as the Shroud here will garner a different response. You are now able to assign a raider gang to this section of the park to complete the quest. The flagpole for raising a gang flag can be found on top of the theater next to Sherrif Hawk.

Rewards

 * Western revolver - Given to the player by One-Eyed Ike.
 * 200 caps given by either Sherrif Hawk or Sherrif Eagle