We will be staying at AKL in February, and we will be celebrating my twins'10 th birthday .. I was given some pointers for birthday surprises, such as getting birthday pins from City Hall in MK, and getting birthday hats for them to wear, and they say that they will get a lot of extra attention by CM's that way.
We have been to Disney a few times, and Chef Mickey's is their favorite place to eat. Apparently if you tell them it is your birthday, you get a birthday placemat, pin/button and a cupcake.
I can give you more info after we get back, and can tell you about all our birthday experiences.