Precious Medals

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

Quick walkthrough
Head to the Ferris Wheel in "Kiddie Kingdom" where the dispenser will be by the queues. Next go to "Mad Mulligan's Minecart Coaster" in "Dry Rock Gulch", the dispenser will be by the gift shop counter.

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 and can easily be mistaken for Nuka-World's trash bins at a glance, 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-Cola Grape and Nuka-Cola Quantum each, as well as a minor amount of XP.

Bugs

 * The quest may not recognize that the Treehouse medallion has been dispensed/received. This may or may not prevent the quest from completing.
 * The quest can be advanced with the console command "SetStage 0603AC61 80", return to N.I.R.A. to collect the reward.