Another thing not to miss is Fantasmic at MGM. If you have only 3 days, then I would suggest doing AK and MGM in the same day. At the Ak don't miss It's Tough To Be A Bug, the Safari, and Rapids..oh Don't miss Lion King. Then goto MGM get a fantasmic dinner package before you go that way you won't have to wait in line and you are gauranteed a spot to see it.
the 2nd day has to be Epcot. Take time for the sight seeing at the countries. It really is great.
Save the 3rd day for MK. But start your day with breakfast at Chef Mickey's. You can walk from the Contemp right over to MK.
We started a new tradition for the past 2 times. It is always Chef Mickey's then MK. For some strange reason it has for the past 2 times ended up being on a Tuesday. Hmmmm.