Check out time is at 10am, but you may request for late checkout (which is 11am), depending on how busy they are.
During our recent stay, we had a late flight out of MCO. We check our large bags with the bell desk and then hung out at the main pool for most of the day. There are restrooms with showers and lockers located in the main building (near the Activities Center). You are also allowed to check out towels so you don't have to worry about drying yourself. It was a relaxing way of ending our vacation instead of sitting in the airport for hours.
HTH!