MK
Get a real Cinderella attraction, the Carrousel isn't good enough. One of the all-time beloved princesses needs a real attraction.
Bring in the NBC theme for Haunted Mansion for the holidays. I'm sure anyone who has not been to DLR would appreciate seeing what kind of hoopla surrounds this amazing attraction.
Get rid of Stitch in Tomorrowland, I hate that "ride" & it always tries to kill me with its robotics.
Get rid of Snow White. It flat out scares little children anyways & it doesn't belong in Fantasyland. Bring in the Seven Dwarves mine ride that another Diser suggested.
Open Little Mermaid as a dark ride at Ariel's Grotto.
Bring in a few new TS restaurants
At least one new huge E Ticket thrill ride needs to be in this park, it could use it more than any other except DHS.
Epcot
Bring back Wonders of Life
Get rid of Honey I Shrunk The Audience
Get some more good CS restaurants
Use some of the space to create a new country. I'd say Australia but it seems more like a fit in AK.
Canada needs a ride of sorts, maybe a bobsled through the Canadian forest
Epcot needs a new E Ticket attraction as well, its been a long time since they have had one & a new thrill ride possibly attached maybe to the America pavilion might work well.
DHS
Get rid of the dead-end between TOT & RNRC. Get rid of The Little Mermaid show & theme it with something new & different.
Bring back Superstar Television & the new Who's Line is it Anyway attraction with a few other shows in the new Broadway area of the park
Continue making
Pixar Place great with the Monsters Inc coaster
Kill Narnia & replace it with well anything
Close Indy & build the DLR ride instead, its time for a change
Star Tours 2.0
New Muppet Movie
Revamp GMR
Get rid of the Sorcerer's Hat
A few new rides are very much needed at this park
Kill the Backlot tour, with LMA there isn't much of a point.
AK
Bring in Australia with a new Kangaroo type flying coaster.
More trees please, shade is very much needed here
A few more rides might be nice as well
DTD/PI
Re-Open Pleasure Island! No questions, bring back nightly entertainment to PI. All the clubs(especially CW) & maybe a few new ones not just Celebrate Tonight which is abysmal.
Move something of worth that will make money into the Virgin building
Get a new Cirque show
Resorts
Need a new Value resort, i've stayed in all 4 & i'd like a new change of pace
General
Let Donald's OJ Bar be in every park. I hate having to go to AK only to get one
Bring back Chicken Strips
Extend the Monorail
Resort to Resort transportation