Hi, Nicola and welcome back!
Thanks so much for sending me your question too! I just love living vicariously through the very Princessy day you are planning for your daughters. They are going to have the time of their lives and the magical memories you all create will surely last a lifetime!
I've consulted some of my fellow Panelists for some ideas on a quiet break spot for your family at the Magic Kingdom and we've come up with a couple of suggestions that I think will be great! They are both in Tomorrowland and will provide some nice downtime for all of you before your enchanting dinner at the Be Our Guest Restaurant in Beast's Castle.
First, take a ride on
Walt Disney's Carousel of Progress. This indoor, revolving theater will take you from act to act like a carousel! It's got a catchy tune and I'm certain that you'll all just love it! Show time is about 21 minutes. Next, hop on the
Tomorrowland Transit Authority PeopleMover. This is one of my family's VERY FAVORITE attractions! It's a 10-minute long, slow-moving ride that takes you in and out of several attractions like Space Mountain and Buzz Lightyear's Space Ranger Spin. You can always ask a Cast Member if you can stay on if there is no line, and they might just let you do it! Those two attractions will give you at least a half hour of down time and it's a pretty short walk over to New Fantasyland from Tomorrowland.
I hope this gives you some ideas and I encourage you to write back in with any other questions you think of!
Have a Pixie Dusted vacation!
~Jackie