I'll give a brief tease in that...
We all look up to and aspire to be Walt Disney -- I mean if I could probably meet anyone famous who has passed away it would probably be Walt.
And a lot of what Walt loved became Disneyland and the Magic Kingdom as we know it.
For instance -- Walt loved outer space (hence the ideas for Rocket to the Moon, Space Mountain, etc)
Walt loved all things Polynesia
He loved trains and old fashioned town settings that he grew up in
He loved telling stories - many times acting them out for his employees to inspire them
And California is an essential part of Walt's life as he created Mickey Mouse on the train out there, made his films and fortune, and settled down out there.
And he loved Progress
And he loved history
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The pull nowadays is towards -- what popular IP could blend into this park or that park, often times with a disregard to thematic backdrop and story (Epcot is a prime example). I'm not against IPs like Star Wars...but that to me ....it needs to fit into the narrative of the park (like a Hollywood Studios) but not a Magic Kingdom.
What I'm thinking of is a "back to the basics" park -- told to a new audience. The theme would be ...Walt Disney and keeping true to the man who started it all, with a core values theme park for all to explore.
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This theme park would have lands such as: (names can be changed)
Colonial Street (inspired by Liberty Square/Main Street U.S.A./Edison Square (entrance to the park); featuring Walt's love of history)
Polynesia (inspired by tropical, Caribbean themes of Adventureland, Treasure Cove, Adventure Isle)
Carolwood (inspired by Frontierland and Walt's love of trains)
Pacific Wharf (inspired by the quaint designs of New Orleans Square and Liberty Square; modeled after old fashioned San Francisco)
Storybookland (inspired by Fantasyland, Storybook Circus, Villains Land, and Walt Disney animated films)
Tomorrowland (it's too iconic of a name...inspired by Walt's love of outer space - a merger of both Discoveryland/Bay and Tomorrowland)
Progressland (inspired by the 1964 World's Fair and Walt's love of progress, a "prequel" to Epcot)
I'd like to link these to show that while this park keeps these same core values, they'd be written in a different context.
Our park slogan: (forgive my late at night writing)
This is a world of adventure, fantasy, and hope. A tribute to the visionaries of the past, present, and future. A Magic Kingdom that embodies the philosophies of Walt Disney and the entire Disney organization. May this happy place be a source of creativity, exploration, and discovery for all who aspire to believe...'if you can dream it, you can do it'.