How wonderful! Our family was created by adoption and it has been the most wonderful nineteen years (our daughter is in college now). I was not a Disney fan until I saw it through Sarah's eyes (at age four). Now I am hooked. When Sarah was younger, we took our cues from her as to what we should do regarding park, hotel pool, etc. I do not know about your little guy but Sarah enjoyed doing things outside the park as much as in the park. Even when staying elsewhere, we would go over to Wilderness Lodge and rent bikes to ride around the camp grounds, go mini-golfing, tour the different resorts, etc. Look for things to do that go beyond the parks so that it becomes a "Disney experience for him" and not a "theme park experience". And the biggie for us, remember it is ok to say no when you realize he is getting tired and needs down time ("No, we can't ride more rides, Dads need a nap.")
So very happy for you guys, all three of you.
Kate