Here's how I would improve Magic Kingdom.
Main Street USA
- Open a new version of The Walt Disney Story somewhere (maybe in the Main Street Exhibition Hall).
- The Walt Disney World Railroad gets some more themed elements around the track and a diorama or two - preferably one with dinosaurs.
- The park gets a new nighttime parade, sort of a cross between Main Street Electrical Parade and SpectroMagic.
Adventureland
- Refresh the Jungle Cruise. More gags, more animatronics, more special effects, less "durr hurr monkeys are funny".
- Use the remaining land in Adventureland between the Jungle Cruise and Pirates of the Caribbean for an Indiana Jones ride similar but not identical to Disneyland's.
- Refurbish Pirates of the Caribbean. Keep the movie elements, but switch the dialogue back to how it was before, so instead of the pirates looking for Jack Sparrow, they're looking for the town's treasure and don't know that Jack is sneaking around trying to find it first. Bring back the barker parrot, too.
Frontierland
- Disney would never actually do this, but... Splash Mountain returns. Redecorate the queue to include information about how the characters got their start in African-American folklore. Hire storytellers to tell Brer Rabbit stories outside the attraction. As for the attraction itself, simply fix up any animatronics that need it and bring in a few animatronics from Disneyland's version (assuming any of them still exist) in certain spots.
- The Country Bear Musical Jamboree gets seasonal overlays.
- Use the "Beyond Big Thunder" expansion pad for a new land based on New Orleans, headlined by a Princess and the Frog dark ride that doesn't focus on food co-ops and salt mines and a Tiana's Place restaurant.
Fantasyland
- Peter Pan's Flight also gets a refresh.
- Princess Fairytale Hall is replaced by a new dark ride. Possible themes include Robin Hood, One Hundred and One Dalmatians, Sleeping Beauty, and The Nightmare Before Christmas.
- The garden where Merida does meet and greets becomes a designated meet and greet location for the princesses.
- Mickey's Philharmagic gets the same "randomized" technology that Star Tours uses. New segments include "Pink Elephants on Parade", "Shiny", and "I See the Light".
- Enchanted Tales With Belle is replaced by that animatronic Beauty and the Beast show pitched for Disneyland Paris.
- Little Mermaid desperately needs an overhaul.
- Add Disney characters to "it's a small world" - but make it subtle.
- Pete's Silly Sideshow in Storybook Circus becomes a dark ride. Pete is the ringmaster of a circus featuring by obscure Disney characters like Humphrey the bear, Horace Horsecollar, the Three Little Pigs, Lambert the Sheepish Lion, and Salty the Seal.
- Tomorrowland Speedway is bulldozed. One half of the land is used for an Alice in Wonderland dark ride...
Tomorrowland
- The other half of the Tomorrowland Speedway is used for a whimsical new dark ride for Tomorrowland called Mars Rover Racers, in which guests race Mars rovers around a planet filled with goofy aliens.
- Monsters Inc. Laugh Floor is moved to Disney's Hollywood Studios . Maybe they could bring Timekeeper back?
- Buzz Lightyear's Space Ranger Spin is refurbished, with more emphasis put on your actually being on an adventure with the "real" Buzz Lightyear that the toy is based on (as in, more Buzz Lightyear of Star Command Buzz, not Lightyear Buzz) as opposed to the size of a toy (to quell the "it doesn't fit in Tomorrowland" complaints).
- Put something in the now-empty Stitch's Great Escape building.