Hi, Caroline!
Thanks for stopping by and visiting with the Disney Parks Moms Panel!
This is a great idea! After a day of travel, my family often takes our time to visit our first park.
Happily Ever After is scheduled to begin at 9pm on the night of your arrival which gives you 4 hours in the Magic Kingdom to enjoy the attractions!
With the Extra Magic Hours, you'll be able to enjoy the park without as many guests. The lines and wait time should be low. Typically during this time of year, the crowd levels are easy to bare. The large crowds don't usually arrive until about the week of Thanksgiving!
Oh, and while you're watching the fireworks at Disney's Polynesian Village Resort, stop by
Pineapple Lanai and have a Dole Whip! Dole Whips and fireworks are the perfect pair!
Enjoy your time at Walt Disney World, Caroline! If you have more questions, please stop by and visit with us again soon!
Happy planning!
Korliss