Don't know about before check-in, but.......we stayed at POR back in 2000 when it was still DxL, and the day of checkout, we had a very late flight home. We checked out early and had the hotel store our luggage except for a knapsack which held our swim suits. We spent most of the day at Downtown Disney, then came back to the resort and spent a few hours at the pool before the towncar came to get us. We changed in the bathrooms right next to the pool, put the wet suits into a plastic bag in the knapsack, and we were all set to go! It was a nice, relaxing (and cool!) end to the vacation!
Sammy