The Grand Tour

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

Detailed walkthrough
After the Sole Survivor meets the bosses of the gangs, it is time to begin the conquest of Nuka-World. All five parks need to be taken over, with each one being given to a chosen gang.

To complete this quest and achievement, the following quests must be completed:
 * A Magical Kingdom
 * A World of Refreshment
 * High Noon at the Gulch
 * Safari Adventure
 * Star Control

Bugs

 * At the end of the quest, talking to Gage does not allow one to continue the quest.
 * This should be fixed with version 1.7.19.
 * After finishing speaking with Gage at the end of the quest, the game has an error.
 * When you complete A Magical Kingdom and clear all the other parks before starting this quest, the quest log will keep telling the player character the locations are not secure and not show that Kiddie Kingdom can be given to a gang.
 * The only way that seems to fix this is to deselect the quest in the Pip-Boy log, save, quit, then reload. The quest will update and say that one can now assign Kiddie Kingdom to a gang, but still tell the player character that the other parks are unsecured. Clicking on the flag at the parks will still let one assign the locations and the quest will move on to talking to Gage.