Hi Jennifer,
Welcome back to the Disney Parks Moms Panel! We love when our guests return with more questions!
The Plaza Restaurant recently started serving breakfast and it has gotten rave reviews. I think it's a lovely way to start your day at Magic Kingdom Park. I can understand why you would want to get an early start and hopefully a good photo with
Cinderella Castle.
Currently, guests are allowed inside
Magic Kingdom Park one hour before park opening time. If the park opening time is 9 a.m., all guests will be allowed in the park and encouraged to explore Main Street, U.S.A. It's possible you will be allowed in shortly before 8 a.m. since you have a breakfast reservation at The Plaza Restaurant. There will be a Cast Member at the park entrance with a list of early dining reservations. You will need to speak to that Cast Member to verify when you can go in.
Jennifer, thank you for visiting with another great question. I hope you'll let us know if we can help you with any other questions.
Wishing you a magical vacation,
Amy H.