if they like animals and things like princesses, playhouse Disney and Toy story, I would skip Epcot this time around. If not into animals, skip AK. Or make a half day at DHS/AK so you can visit all parks.
Again, depends what they like. DHS for us is a half day (Little Mermaid, Beauty and the beast, Toy Story and walk around - she doesn't like playhouse disney); AK as well, we only do the safari, lion king show and spend a bit of time in Dinoland.
We like to walk around Epcot because there are a lot of characters and we relax a bit more (look at the flowers and outdoor displays, etc), and DD likes Soarin.