For the first time ever I did all four parks on my second-last day of my solo trip last August 2008, and ended the night at the Adventurers Club at Pleasure Island.
Let's see, I started out after leaving Shades of Green, walked over to the Poly and grabbed a bus for Animal Kingdom. Wanted to see the opening show of the day, but since my vacation was in the middle of Tropical Storm Fay (it rained three days straight), the opening was nixed. I hit things I had not done before (Harabe Wildlife Preserve, Festival of the Lion King, Nemo show), I was off to MGM/Hollywood studios, then walked to the Boardwalk, got a malted shake at Beaches and Cream at the Yacht and Beach Club, entered the International Gateway, caught the American Advenuture show, got some soda at Club Cool, hit Spaceship Earth a few times, before hopping on a monorail to the Magic Kingdom.
By that time it was 7pm and Tropical Storm Fay was saying goodbye with this ultimate gullywasher that cleared out Main Street (see below). I trudged down Main Street, watched kids of all ages jump in and out of huge puddles. I only visited the Haunted Mansion and Pirates of the Carribbean, but it was well worth it.
Soaked to the bone, got back to Shades of Green, took a shower, changed into some okay-ish clothes and visited the crew at the Adventurers Club one last time (got to the AC about 9:30-10pm).
I got back to the room about 1am, packed, got up about 6:30am, checked out, stored my luggage, and hit three more parks before I had to leave for my 8pm flight out of MCO. Got over to MGM for their extra morning hour, by 10am I walked over to the Boardwalk for a snack, traveled from France to Mexico through a deserted World Showcase, went on Spaceship Earth before catching the monorail back to the Magic Kingdom for some mid-afternoon heat and another gullywasher of a storm. Managed to get over to Downtown Disney and did some shopping before catching my Mears taxi to MCO.
Will I do four parks in a day next time? Maybe, probably. I accomplished the feat, but I hit what I wanted to do, but if I tried to ride every ride, there would be no way for me to do everything at all the parks in a day.
Still, though, can't believe I did it.