We have twin boys who will be three in November. We took them at age 1 and age 2. Age 1 was a pretty difficult trip, but age 2 was great. We found that it was easier to go to the parks when they opened, then take a nap break at the hotel after lunch, then return to the parks after in the late afternoon. I personally don't want to sacrifice ONE MINUTE of park time, but it really was better for all if the boys had slept.
Remember to bring ample snacks and drinks; we always give the kids something if they are going to be in line for 15 min or more.
If you are planning to bring your own stroller, consider a hotel on the monorail so you don't have to fold it so much for the busses. The ap rates for your week are great. We will be there that same week, good luck!