Kangaroo - I think you'll enjoy Epcot - plan 2 days. One for Futureworld and one for World Showcase. While Innoventions is a lot of kid stuff we bunch of grown ups had fun being kids again too. Don't forget to go inside the Epcot ball on Spaceship earth and do everything in the Land and Sea pavilions. Maybe Wonders of Life will be open when you go. In World Showcase, everything is an experience IMHO (you can tell I like Epcot). The films, the boat rides, the sounds, the gardens, the smells. One of our funnest moments at World Showcase was looking at the labels in the gift shop in China and finding out very little was made in China (when everything else in America seems to be made in China!

We loved the Umpah band in Germany's Biergarten. Our waitress said she came to work for one year - that was 20 yrs ago. Hopefully Soarin' will be there when you go. We stood and listened to the band in Mexico and tried on all the hats, played with all the instruments for sale. In Norway we got a sugar rush at the pastry shop. The garden in Japan was great. - Well, like I said, you can tell I like Epcot!
In our group the 11 yr old girls seemed to be utterly bored with Epcot but they spent 3 days at Magic Kingdom and could have gone more.