Hi Chad,
I'm not sure what time you are planning to eat at Whispering Canyon Cafe, but if the timing works you might consider taking the boat to Fort Wilderness for
Chip 'n' Dale's Campfire Sing-A-Long. There's a campfire, you can purchase a S'mores kit, enjoy singing along with a cowboy, and visiting with Chip and Dale. If your daughters are night owls, an outdoor movie follows the campfire.
You could also simply spend some time walking around the campground at Fort Wilderness and admiring the Halloween decorations. You will not believe some of the elaborate displays the campers bring and set up at their campsites!
Thanks for stopping by the Disney Parks Moms Panel. Please let me know if I can assist you further with suggestions or with any other questions.
Wishing you and your family a magical vacation,
Amy H