Oh wow, Lindsey, your vacation sounds amazing! I love the idea of topping it off with a stay at the beautiful Polynesian Resort.
With all of the recreation options at the Resort you should have no problems keeping the boys amused.
There are 2 heated pools, including the famed Volcano pool that has a 40 foot volcano, waterfall and 142 foot tubular water slide! This is a zero entry pool that is truly an impressive sight.
A 24 hour arcade is available which never fails to make my son drool a little. Ok, my husband, too!
You will have 3 beaches that are the perfect place to walk at night for a great view of the Electric Water Pageant and the nightly fireworks from The Magic Kingdom.
At the Marina you can rent bikes and watercraft to take out on the Lake. And ask the Concierge about arranging a fishing excursion for the family.
I hope you and your family have a fantastic vacation! I'll be there in October too, so if you see a crazy girl with Mouse Ears on it might be me so be sure to wave hello!