Quite frankly, with a 10:30 "Be-at-the-resort-ready-to-be-picked-up" time, I wouldn't do a park that morning. You'll only be able to spend a very short time in the park given the time you need to allow to catch a bus back to the resort. I'd just relax for a couple of hours in the resort. We've done a "dash" to the park before DME and we had a close call making back to the resort in order to catch the airport bus. We had to bail on the resort bus that never came and hail a cab and only made it back about 10 minutes before our DME bus pulled up. Spending 60 minutes in MK isn't worth a potential panic attack when you're afraid you'll miss the bus to the airport!
However, we did go to MK this month for a couple of hours before our DME bus. But, we were at VWL and had a much later 3:30 PM DME bus. We packed, checked out at 11 AM, checked our bags, and then went to MK. I set a "be at the WL boat dock" time of 2:00 PM and it worked out fine. We had 30 minutes extra time at the resort to enjoy the lobby after we ate a late lunch at the snack bar and collected out carry-ons from the Valet before we had to move out to the DME bus stop.