We're in the same situation. We're going down for a family reunion in November. We were just at WDW last year, and can't really justify another full-scale Disney trip right now, but I hate to go all the way down there and not see Mickey!
Here's what we're planning:
One day we're going to have breakfast at Chef Mickey's, and then tour the resorts for the day. We're going to ride the monorail around to the monorail resorts, and spend at least a little bit of time wandering around each one. Then we'll take a boat to the Wilderness Lodge, and I guess drive to AK Lodge. We'll spend some time swimming at the resort pool. In the evening we'll go to the Boardwalk to wander around at eat ice cream at Beaches and Cream. I'm hoping to catch at least a glimpse of Illuminations from outside the park.
The next day we're going to MK for the day. The park closes at 6, but in my experience they don't rush you out of the park. We'll really take our time leaving, and enjoy the lights on Main Street and on the castle.
We're going to stop at Downtown Disney for at least a little while on another day (while driving between various family members' homes in Florida.) The
Lego store is like Mecca for my 11yo Bionicle-loving DS. And I really want to visit the new toy store. We have a Rainforest Cafe near home, but if we didn't we would probably stop in there at least for a snack. Maybe we'll get an ice cream at Ghirardelli.