Precious Medals

Precious Medals is a side quest in the Fallout 4 add-on Nuka-World.

Quick walkthrough
Speak to the robotic navigational guide, N.I.R.A., on the streets of Nuka-Town, and she will inform the Sole Survivor of a task undertaken by all guests to the park: collecting special park medallions from all the major parks in Nuka-World. If they do this, she'll give them a special reward.

Detailed walkthrough
Precious Medals is a simple collection quest that can be completed as a side activity during The Grand Tour since all the required locations are visited during the latter quest. Every location where a park medallion needs to be picked up has a park medallion dispenser close by. These waist-high gadgets are fairly inconspicuous, so a bit of searching may be required to find some of them.

Once all medallions have been acquired, return to N.I.R.A. for the reward consisting of one bottle of Nuka-Cola Dark, Nuka-Grape and Nuka-Cola Quantum each, as well as 75+ XP.

Bugs

 * The quest may not recognize that any medallion(s) have been dispensed/received, if obtained prior to talking to N.I.R.A.; this may or may not prevent the quest from completing.
 * The quest can be advanced with the console command, return to N.I.R.A. to collect the reward. At times this command doesn't work. Use to complete the quest.
 * If the treehouse medallion was obtained prior to receiving the quest, it won't be checked on the quest log, but the Nuka-Racers medallion will not appear on the log. Collecting all medallions including the Nuka-Racers one will allow the quest to progress.
 * The elevator to Cappy's treehouse can sometimes be activated without turning on the power to Nuka-World. This allows for the completion of the Precious Medals quest prior to the Nuka-World DLC's main quest conclusion.