Don't know specifically about the rules on this one, but the only park officially called "Magic Kingdom" is in Orlando.
Disneyland California was originally referred to as The Magic Kingdom, but not any longer.
Not trying to stir up the pot. Just want to get things straight. I have no problem if Dana's meaning for the contest is that any of the 5 "major" parks park; ie: Disneyland Paris, Hong Kong Disneyland, Tokyo Disneyland, Disneyland California and Magic Kingdom Orlando.