How much do you like to shop, do you plan to go to Pleasure Island, Disney Quest etc, etc.
For us, when we go in the off times of year when parks close early, we just head to DTD. We spend a good deal of time there. I like to hit it on our first day and on a day somewhere in the middle of the trip and then on the last day. There's always something going on and lots of things to see and do.