Yep, you can get in the parking lot, and enter the resort and lobby at any hour. Once the computers roll over at 6 AM you technically are a resort guest and get all benefits at that time. In some rare cases you can even get rooms that early. Never hurts to ask. When you complete online check in, you can inform them that you expect to arrive at 6 AM and if you want your room ready early as your first priority, check that box. If they can find a room, they'll do what they can do find you one. Or as early as they can. We've gotten rooms as early as 8:30 a few times. So you never know. Room or not, at 6 AM you are check in and can head out to do whatever it is you plan for the day.