For those of you leaving early for Orlando, I would like to suggest a couple of activities if you have time, energy, or money:
-- 1)
Blue Man Group - Excellent show, very funny. My DS (7 at the time) was belly-laughing so hard.

I took my DS (4 at the time) on another occasion because I wasn't sure if it would be too loud for her. It wasn't and she loved the show too. It is located next to the Hard Rock Cafe, so you don't need Universal Studio tickets to get in. It is a little cheaper than ...
-- 2)
Cirque Du Soleil, La Nouba - Another great show. Awesome, top notch (perhaps Olympics quality) talent!! If you've never been to a Cirque Du Soleil, then here's your chance. It is a little more pricey than BMG.
-- 3
) Fantasmic, at Disney Hollywood Studios (formerly MGM). One of our favorite park closing shows; Park tickets ARE required. It is located near the
Tower of Terror, which in my opinion is the best Disney ride of all the parks. Very scary. Even my DW gets scared, and she loves thrill rides.
-- 4)
WDW Polynesian Luau: If you don't have a reservation (which you probably don't), go early and sign up for stand-by seats. It's a nice show and they give you lots to eat. You don't need park tickets to get in; nor do you have to pay for parking - just tell the parking attendant that you are there for dinner. Park right in front of the Polynesian hotel. Bypass the long line, walk right up to the front to get on the stand-by list and wait. Once all reservations are seated, they will begin seating those on stand-by (taking seats of ressie's that cancelled). We've gone 3x and never got turned away. After the show, go ride the WDW monorail while its not busy, BUT ask the attendant if you can ride in the front. Then ride the full circle up front. You may have to wait a few minutes for a monorail with an empty cabin. It is a rare and nice ride.