Margaret,
Let's start with your "touch choice"! While I love both, I would definitely do the
Spirit of Aloha Show, especially since you are staying at the Polynesian. What a great way to get into the theme of your resort. Plan some time before dinner to walk the resort grounds to get into the mood. After dinner plan on taking in the Electric Water Parade (9pm) from the beach, and even the Wishes fireworks from the Magic Kingdom. Get the girls some non-alcoholic umbrella drinks from the bar in the resort's main building and really do it up right!
Other special nights out are all over the place. While there are so many to choose from, I have one that I think your daughters might enjoy. Instead of a traditional dinner at some table restaurant, why not try
Snackapalooza!
What, you ask, is Snackapalooza? Take your family to the Epcot World Showcase one night. Don't get a table reservation. Instead, visit the stands, counter service restaurants, and carts in front of the 11 national pavilions. Try something from every country, and SHARE! Discover the world together!
Send me more questions!
Have a magical (and delicious) vacation!