These are mine.
MK- Right in front of the Barber Shop on Main Street (so for the day parade you are at the end, and the beginning for Spectro)
AK- I like to watch across from KS. So this can be either at the beginning, or the end of the parade- depending on when you get there.
MGM- I like to watch at the beginning. There is a resturant across from Star Tours (I forget the name) that has chairs that you can drag up to the rope.