Hi, Paul! How wonderful you are for wanting to make this trip so special for your granddaughter! She must be a very special girl!
There are several things you can do to surprise your granddaughter and the other members of your traveling party. First, check out this website for the
Disney Dream Makers. They can arrange special decorations and wonderful surprises for your resort room, or they can even find you at a restaurant or special location inside the theme parks!
Another place you should look for gifts that set a magical tone is
Disney Floral and Gifts. You'll find something special there for every occasion and any budget. Whether you are looking for a grand birthday wish or a lovely princess tiara, they'll have something special there.
I do want to mention that you cannot have anything waiting in your room upon your arrival. Deliveries to your rooms cannot be made until after you've checked in at your resort, but you can arrange to have them made while you are off visiting a theme park or touring the resorts.
I hope your vacation - and your granddaughter's - is magical every moment!