You know, most people talk about spending an entire day at a certain park, but in reality, you can do one park in the morning, and another in the afternoon. For example, you could hit the MK in the morning and do most of the rides, then AK in the afternoon because they really only have two major thrill rides, and the lines move well for them. And since you are adults, you'll probably skip the kiddie stuff and do the thrill rides.
Are you driving down or renting a car?
And can you wake up early each morning and be at the gates when the park opens?
For onsite guests, one disney park opens at 8am each morning (called surprise), and it's different each day. I would hit that park in the morning, then do another in the afternoon.
Sunday - Surprise park in morning, AK in afternoon.
Monday - Surprise park in morning, Epcot in the afternoon including world showcase at night.
Tuesday - Surprise park in morning, do any favorites you missed.
Wednesday - Check into USF hotel at 7am, get magic keys (room will not be ready), goto IOA, use FOTL. Check into hotel at 5pm, parks will close early so you won't do another park for the evening and your feet will be tired. Go to the hotel pool and relax (if warm enough).
Thursday - USF
Friday morning, do any favorites you missed (2 hours at the park), check out of USF hotel at 11am, drive home.