I really wanted to wait until the morning of too, and we almost did. However, two of my kids are more like Grumpy Dwarf in the a.m. than Happy! And I feared they'd just roll over and say, "I hate Disney, I don't wanna go!" Ds, who LOVES school and his friends does this in the a.m. -- so we decided to tell them early... I actually posted this earlier today, but to make it short... We have 4 kids and so I bought a pkg of white 16 piece puzzles from the craft store. They came in a set of 4... yay me!
I drew different "clues" on each puzzle such as an airplane with a Mickey Balloon, the sorceror's hat, the words POP CENTURY (for my readers + we've been there before so they know what this means!) with Mickey heads, and an "attempt" at a Castle! We put the puzzle pieces inside color coded eggs and put the eggs all in one basket. Each child would find their specific colored eggs (i.e. all the pink ones, all the blue ones) and put their puzzle together. As they pieced them together, they figured out their clues.
They had a blast doing and re-doing the puzzles and seeing their siblings' clues. Plus, now they have a "souvenir" and can play with them on the plane (they are small puzzles).
I still like the idea of just waking them up but this is what we came up with and I'd say they enjoyed the surprise. Now, we are counting down the days and it's starting to sink in. I'm taking each one aside and asking them what they really want to do there so I can make sure I can fulfill their expectations!
An ASIDE: It's funny to learn what their expectations may be... for example, all ds3 REALLY wants to do is get another pirate sword and hat and ride POTC. One of the first things dd5 said she is looking forward to is swimming in the pool! DD2 said she wants to see "Minnie -- the boy one!" I said, "You mean Mickey?" DD: "Yes, the boy one!" lol.... too funny!
I hope they like whatever you do!