The Grand Tour

The Grand Tour is a quest and achievement/trophy in the Fallout 4 add-on Nuka-World.

Quick walkthrough
Having met all the gang bosses, Gage now believes it's time to take over the rest of the park and assigns you the job of clearing out park areas and assigning them to a gang by placing down one of their flags.

Bugs
There is currently a glitch when at the end of the quest, talking to Gage does not allow you to continue the quest.