Precious Medals

Precious Medals is a 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 you of a task undertaken by all guests to the park: collecting special Park Medallions from all the major parks in Nuka-World. Do this and she'll give you 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 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 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.