You can check in any time - we've done it as early as 7:30 a.m. Your room may or may not be ready, but they'll go ahead and issue you your card keys, but without telling you what room they'll be for. They'll give you a phone number to call, you'll go on ahead to the parks (leaving your luggage with Bell Services if you like), and when you call the number later, they'll tell you if you're room's ready or not. When it is, they'll let you know over the phone what your room number is, and your key card will be activated at that time. There won't be any need to go back by the front desk - just go straight to your room whenever you're ready.