Hi Natasha,
Honestly, there are lots of attractions for your group to enjoy at all four of the Disney Theme Parks.
I would recommend that you plan on spending one full day at the Magic Kingdom, Epcot, Disney's Hollywood Studios and Disney's Animal Kingdom during your visit.
This will allow you to experience lots of all that there is to see and do at the Disney Parks.
I would recommend that you spend some time looking at the various
Rides & Attractions on offer at each of the Theme Parks on the Walt Disney World website to help you to decide which ones you would like to try during your stay.
My 9-year old Sons favourites include Soarin', Test Track, Big Thunder Mountain Railroad, Mickey's PhilharMagic, Toy Story Mania, Rock 'n' Roller Coaster, Kali River Rapids and Expedition Everest.
Wishing you a magical trip filled with memories which will last a lifetime!