Hi Jacque!
Welcome to the Disney Parks Moms Panel! What a great "nana" you are, taking your granddaughters to the Walt Disney World Resort! As you plan this birthday extravaganza it is important to remember that in four days there is no way to do it all. You will need to set priorities. I would start by having the girls identify each of their one or two must-dos in each park. This will give you a good starting point. You can have them check out all the attractions and shows on the
Disney Parks website for a point of reference.
I also HIGHLY recommend developing an itinerary. This will help you from becoming overwhelmed and distracted by all there is to see and do. My go to resource for itinerary planning is touringplans.com. There is a wealth of information on that site and for a very reasonable fee you can access pre-designed touring plans or even develop a plan customized just for you. If you have time and enjoy reading, I also recommend the book ""The Unofficial Guide to Walt Disney World." It is written by the same folks that manage touringplans.com.
Once you arrive, make sure and pick up a couple Birthday pins for your granddaughters at guest services. This will make sure they get many "Happy Birthday!" wishes from Cast Members and other Guests.
As you plan I am sure you will have more questions. Please some back to the Disney Parks Moms Panel, we love to help!
See ya real soon!
Anne