Danielle,
So now to plan what parks on what days! Unfortunately I did not see in this question exactly what days you are coming, which can play an important role in what park/what day. But here are a few pointers;
With 7 total days, and children aged 8 and 4, I would do the following;
- 3 Magic Kingdom days
- 2 Epcot days (because you have so many table service dining credits)
- 1 Hollywood Studios day
- 1 Animal Kingdom day
But since you are breaking up into groups (some parents with kids, other adults off on their own), and presumably will get park hoppers, you will probably find that the kids group spends more time at the Magic Kingdom, and the adult group spends more time at Epcot and the Hollywood Studios.
If you will write me back with your planned travel dates, we can plan out where to go on what day. Also let me know if you will get park hoppers, as well as if you want suggestions on where to go based on two groups.
Have a magical vacation!