Just jumping into your ptr!

A few things I have seen people doing:
Try to make a rough plan, but don't plan on sticking to it, because magic can and will happen during your trip. Maybe look at each park and choose what is most important to each person going? That way, you are sure to hit those things at least. I have never been on a wish trip, but I am a mega planner.

Look at the dates you are there and see what each parks hours are and the parades or fireworks. Maybe even try to see which ones are usually the most/ least busy? I think though with your GAC you will get, it won't matter too much though, unless they close early or something.
Also, check what parties you want to hit at GKTW- that way you can plan a shorter park day for the parties that matter most. I'm a big Harry Potter fan too and I know I wouldn't want to leave the park for a party at GKTW the day I went there for example...

I know Sea World closes early, so I would plan that for a day of say... the Christmas party at GKTW (one I would hate to miss!).
Anway, dunno if I helped any, but it's an idea of sorts. Just know, your trip will be great either way- planned or on the fly! You got your ADR for Akershus and that is a great one! We went there and the kids loved it, esp my daughter! Just have fun with it!