Not sure how little your kiddos are, but here are the must do's of DS10 and DD6:
MK - DD6: Splash Mountain, BTMRR, Haunted Mansion, It's a Small World, Peter Pan, Winnie the Pooh, Mickey's Philharmagic, the Indy Speedway

, Goofy's Barnstormer
MK - DS10- Space, Splash and Big Thunder Mountains, Mickey's Philharmagic, Pirates of the Caribbean, Buzz Lightyear
Epcot - DD6-Mission Space, Soarin, Spaceship Earth, Nemo ride, Living with the Land ride, Chinese acrobats
Epcot - DS10-Mission Space, Test Track, Soarin, Innoventions
DHS - DD6 - Playhouse Disney show, HSM Pep Rally (if they still have it), Little Mermaid Show, Star Tours
DHS - DS10 - Tower of Terror, Rock'n'Roller Coaster, Toy Story, Star Tours, Lights, Motors, Action stunt show
AK - DD6 - Safari, Kali River Rapids, Triceratop Spin

, Maharajah Jungle Trek
AK - DS10- Expedition Everest, Safari, Kali River Rapids, Primeval Whirl

, Maharajah Jungle Trek
They also both love meeting characters, the parades and the night time shows.
