For the first time ever on Leap Day, 2012, both Disneyland Park and Magic Kingdom Park will be open for 24 hours! Starting February 29th, at 6:00 a.m. you can enjoy select attractions, entertainment and services until March 1st, 6:00 a.m.*
Coming from Southern California I always recommend the night shows. You have to check out the special 1:00 a.m. showing of Fantasmic! The firework show is amazing!
More about: One More Disney Day
*Hours of operation 6 a.m. on 2/29 to 6 am. on 3/1; subject to capacity restrictions. Valid theme park admission required.