You might want to go over and check out the rec room at Boardwalk. My kids are you age and have spent a lot of time playing pin ball, ping pong, video games etc for free.
OKW also have ping pong, shuffle board and tennis courts right next to the pool which is nice if you want to lie by the pool.
Pool hopping also can be fun and checking out the other resorts.
Watching the fireworks from the poly resort beach is very nice. They have the lighted float parade there too.
You can go back to the Wilderness Ft. good buffet lunch/dinner and ride a pony (well the 5 yr old could) and see the work horses (that pull the carriages). They also have outside movies at night with a fire for roasting marshmellow, the characters are there too.
Have a great vacation.