Sounds like the place to start is to see if you can change your ADRs. Give them a call & see if there availability. If not, your dilemma is solved because you have no wiggle room. If you can move them, I'd go ahead & make the switch because AK isn't that large of a park so, even if you got a late start due to a late night the day before, you still should have plenty of time to see everything.