I'd walk down main street, soaking up the atmosphere while people watching. I would finish by walking through the castle, magically coming back to reality.
I know that I'm going to absolutely this thread. I like to visualize a walk thru some part of WDW before I head off to dreamland.
Before I read everyone else's response which may take me several nights, I wanted to post mine.
I had a "stop and smell the roses" type trip this last September. I found that I adore the resorts and sometimes as much as the parks. I discovered...
...a spot at the Poly just outside of Captain Cooks where a gentle breeze is rustling the leaves on the trees. I'm enjoying my Dole Whip that I got from the self serve machine inside. From my special spot, thru the flora and fauna all around me, I can see the Poly's volcano pool, just past that I can see Seven Sea's Lagoon, and just past that I can see the spires of Cinderella's Castle. I can hear the ambient music of the Poly, the boat horn's, and the train whistle from the Magic Kingdom. THAT is heaven on earth!
I would be teleported to Aloha Isle to get a Dole Whip and stroll over to Main Street and just grab some curb and look out towards Cinderella Castle and people watch