It depends on how early you want to get up. If you have a credit card on file as well as an email then they will be sending you your bill so you don't have to wait for anything in the morning. You can get up as early as you want and then drive over to the MK, park, and head to the park and then when you are ready for a break go check in at Fort Wilderness. You could even leave your stuff with Bell services early and let them transfer it. I would suggest planning on leaving by 7:15 to ge to the MK gates before 8am.