Yet another vote to fix Tomorrowland...it was my favorite Land when I was little (to the point where I built a model of the Peoplemover that wound all the way around my bedroom when I was 10 or so
), and it's just sad to see it in the state it's in. It used to be THE place to be at night; seeing everything all lit up, with so much movement (Peoplemover, Rocket Jets up high & actually looking space themed/"futuristic", and without those fugly giant concrete french fries mucking up the entrance, the Monorail which is thankfully still around, and the Skyway, though I highly doubt that could ever be brought back, for various reasons). Get rid of the dark/"rusty" color palette in its entirety; at least they don't have Space Mountain painted to look like something out of an intergalactic junkyard anymore.
And speaking of intergalactic junkyards, that rotating hunk o' junk in the middle of Tomorrowland needs to GO! And then, there's Innoventions...honestly, if I wanted to see what's inside, I could not waste Park time & go to Home Depot and/or an electronics store. The building that it's housed in is being wasted, IMO. A theater that rotates is still pretty "futuristic", even after all these years since it was built. Put a show in it that makes use of that feature...a show that people will actually line up to see!
Seconding the idea for a drive-in style restaurant in California Adventure; really, there need to be more unique dining experiences there. And the drive-in theme would be PERFECT for Carsland.
Speaking of restaurants, I'd be one of the first people in line if they'd bring back SOMETHING on par with the Tahitian Terrace or Aladdin's Oasis restaurants (or one of those two restaurants reincarnated? hey, as long as we're dreaming!
) to that area which sits unused. I LOVED Tahitian Terrace when it was in operation; never got to experience Aladdin's Oasis, but as "Aladdin" is one of my all time favorite Disney films, I'm sure it'd be an instant favorite!