I took my elder son and GD in January for six days and we did only the main parks and DTD. I just returned May 22nd from a ten day solo trip and did the four main parks and DTD, again. I'm taking my other son and D-I-L to WDW in late Sept and they keep insisting they want to do all four main parks, both water parks, Disney Quest, PI, and go parasailing. At first my D-I-L refused to fly, but now says she will try. Anyway, if we can get her on a plane we will be arriving on Saturday morning and be leaving the next Saturday evening. I keep telling them there is no way we can do everything they want to do in the amount of time we will have.
My son keeps saying it won't be a problem and came up with the following itinerary:
Saturday (arrival day)
DTD
Disney Quest
PI
Sunday
MGM
Monday
Blizzard Beach-AM
Typhoon Lagoon-PM
Tuesday
AK
Wednesday
MK
Thursday
Epcot
Segway tour
Friday
Parasailing
Park Hop
Saturday
Park Hop-AM
Catch plane home