Hi Jay,
What a great surprise for the kids--they will love having dinner at Chef Mickey's!!
From the Magic Kingdom you will jump on the monorail and get off at the Contemporary Resort which is where Chef Mickey's is! Once you are done dinner, you get jump right back on the monorail and head back to the Magic Kingdom---it is very easy and quick!!
You will have plenty of time to enjoy dinner with Mickey and friends and head over to the Magic Kingdom before
Wishes starts. You will be able to see the fireworks anywhere in the park but to see Tinkerbell flying in the sky your best spot will be in front of Cinderella's Castle.
A delicious way to watch the fireworks would be to book reservations at the
Tomorrowland Terrace Fireworks Dessert Party. The party begins an hour before the fireworks and it offers a buffet of sweet treats and beverages for you to enjoy along with a fantastic spot to view the fireworks. You would need to book reservations 407-WDW-DINE for this and there is an additional fee.
Have a magical time on your vacation and enjoy the fireworks!!
Carrie