Hi Katie,
As you have an Advance Dining Reservation at Disney's Polynesian Village Resort, you will be able to park your car for free at that Disney Resort hotel for a period of up to 3 hours whilst you enjoy your breakfast but will not be permitted to leave your car there all day whilst you are at the
Magic Kingdom Park.
Should you wish to enjoy breakfast at
Disney's Polynesian Village Resort prior to spending the day at the Magic Kingdom Park, you have 2 options:-
1/ Drive your car to Disney's Polynesian Village Resort and once you have finished your breakfast, move your car to the Transport & Ticket Center (parking lot for the Magic Kingdom Park) for the remainder of the day.
2/ Take a bus from
Disney's All-Star Music Resort to the Magic Kingdom Park where you will need to transfer to a boat or monorail over to Disney's Polynesian Village Resort. Once you have enjoyed your breakfast there, you will be able to return to the Magic Kingdom Park via boat or monorail and once you are ready to leave the Magic Kingdom Park, you can catch a bus back to your Disney Resort hotel.
Wishing you a magical trip filled with memories which will last a lifetime.
Emma