As has been mentioned, we don't know which rides will be closed when during the day, complicating things. But a 6am start is essential, and I'm thinking that one should start on the non-Fastpass rides in Fantasyland, such as Pan in Disneyland. Thoughts?
And during it, you are going to need some serious food. If we get to eat around the world at Food and Wine, you can eat around the world.
Finally, it's leap day. Celebrate it with the Theme Park Insider Jump Rope Party on your Tom Sawyer's Island at noon (but not the boat though that could be a great story for the next edition of your book). Why should Disney have all the fun. It's TPI time for fun also.
To say the least, this is gonna be a MONSTER day for yours truly. Our troupe will be on hand at the park's opening. While I will attempt to hit every attraction my primary objective will be to compile the definitive collection of Jungle Cruise photos.
After the three o'clock parade, I will bounce out of the park and make my way over to the West End at Downtown Disney. I have tickets to see Flogging Molly blow the doors off the House of Blues.
After getting my celtic-blam-blam on I will swallow a gallon of coffee and a half-dozen Red Bulls and rocket back to the Kingdom. After midnight I intend to marathon the Jungle Cruise.
After the park closes at 6 AM on March 31st I will head home.
If your there promptly at 6am and focused on the rides that could hold you up: Speedway & Haunted Mansion due to lack of Fast Pass and accordingly Fast Passed Peter Pan Jungle Cruise and the Mountains, did the shows Country Bear, Presidents, Phillarmagic, CoP, Stich & MILF after lunch when its busiest you shouldn't be concerned about being there after hours.
As on the proper off season days Magic Kingdom sweep is attainable without the 24 hour timeline.
I felt the same when on Grad Night. My school class was emptying out at around 1 am, but we had to wait until morning before the bus was given permission to leave the parking lot. What a joke.
Best to get a hotel room, preferably at the Disneyland Hotel so you can crash.
Personally, I'd rather go to the parks that won't be open 24 hours since they will probably be much less crowded than usual. Seems like the last few times we've been, we always end up in the magic kingdom, which is great, but I'd like to see EPCOT and animal kingdom, too.