Hi Mark!
There is not better place in the world to celebrate a birthday than Walt Disney World! We visit each year on my daughter's birthday and there are so many wonderful things to do at the most magical place on earth!
Your daughter and her cousins may love
Disney's Perfectly Princess Tea at Disney's Grand Floridian Resort & Spa. The girls can meet Princess Aurora and sing songs with her, dance and enjoy special "tea" (apple juice) and tea sandwiches.
If your daughter likes princesses, she will also love
Cinderella's Royal Table. She will get to dine in Cinderella Castle. Make a notation that it's her birthday on the Advanced Dining Reservation and she'll eve get a cupcake, complete with a candle to make a wish.
Another fun experience would be to book a
Pirates & Pals Fireworks Voyage. You can enjoy the pirate reception with a plethora of snacks before boarding the boat to see the fireworks from the water.
Make sure to ask for the complimentary "Happy Birthday" button when you arrive. She will enjoy everyone greeting her with "happy birthday" all day.
Magically,
Stacy