I would take Walt to the Haunted Mansion, to show him what a great job the Imagineers did in refurbishing it...but then I'd have to expose him to the cluttered graveyard and cut-up queue and to the blurry ghost cartoon that replaced the Hitchhiking Ghosts in the mirrors...so scratch that.
I'd def take him to the Tower of Terror...perfection.
I'd take him to Philharmagic. It's a wonderful magical show, and highlights some of the best of Disney, during and after his lifetime. (Yeah, it's an attraction, not a ride, but still...)
Then I'd take him to Star Tours to show him how crystal-clear and amazing Philharmagic's 3D could look if TDO wasn't so schmucky.
Maybe I'd take him to see One Man's Dream, but then he'd probably wonder why a film about his life in a park he built is so grainy and why the sound is so garbled...*sigh*
Then I'd take him to Peter Pan's Flight, after which he'd probably want to know, given the advanced tech and effects at Star Tours and Tower, why that ride hasn't been plussed yet...
Then I'd take him to Everest and tell him about the broken Yeti. And then I'd follow him when he stormed into TDO headquarters and started kicking some !~That'd be AWESOME.