How wonderful to bring your princesses to meet the princesses! Walt Disney World is filled with many magical princess experiences. Have you considered character dining with the princesses; while reservations may be difficult to get, I'm hoping you will be lucky by traveling before Memorial Day. Two popular restaurants are Princess Storybook Dining at
Akerhaus Royal Banquet Hall at Epcot,
Cinderella's Royal Table at the Magic Kingdom & Cinderella's Happily Ever After Dinner at
1900 Park Fare at the Grand Floridian Resort. Similarly
My Disney Girls' Perfectly Princess Tea Party is held at the Grand Floridian.
Similarly,
Bibbidi Bobbidi Boutique at the Magic Kingdom and Downtown Disney is an opportunity to have your girls transformed into their own princesses. Some parents opt to purchase princess dresses and accessories prior to visiting WDW to help save money, but plenty of choices will be available throughout WDW as well. You may want to also consider little princess souvenirs purchased prior (dollar stores often have items) to the trip to surprise your daughters with (waiting on their pillows at bedtime; next to toothbrushes in the morning, etc).
Finally, make sure and grab a free Times Guide at the parks when you arrive or call the character hotline at 407-824-2222 to confirm available characters, locations, and times for your daughters to meet their favorite princesses.
And by chance did you book your trip through AAA, if so you can take advantage of an exclusive story time experience with a princess.