I know this one well as I like to stay up late and sleep in a bit on vacation...
...for the three resort hotels, they will only grant a late check out on the "day of" departure...meaning they won't grant it the night before you leave if you call, only that morning of and if they are not booked up and need the rooms.
Part of this is due to the high volume of requests. Typically on my day of departure, I get up, pack up, check out, and drop my bags at the bell desk. They will hold them for ya all day so you can still go enjoy the day at the park and you can leave your car at the resort all day if you have one. They you can go get your bags and depart whenever you want to. The few times that I went back to go get my bags to check out mid day, I regretted it and it was a sprint to get back to the hotel in time. Not worth it.