Is 7am our only option to catch a bus...they won't run another one until after 8am? Our kids don't usually wake up until 7-7:30 so I was planning to get ready and wake them around 7 and then get out of the room by 7:20 or so...I guess we need to get up earlier!
If you have an 8:05 ADR, even if the buses ran every 10 mins or so, you still wouldn't make it in time by leaving at 7:20. You could get to the bus stop and watch as the AK bus pulled away, which would mean a wait for the next bus to come. Then it's about 10-15 mins on the bus. Then, a few mins to get from the bus area to the turnstiles. Then the trek to Tusker House...about 8-10 mins.
You need at least 40-45 mins to get from your resort to the restaurant, and that's if everything goes quickly. I always leave about an hour...just to be sure.
The buses start running around 6:30. If it were me, I would be out at the AK bus stop by 7am. If your kiddos are early risers, and you really don't want to wake them that early, I would consider changing your ADR time to one that is later in the morning. I try to get a late ADR for breakfasts within the parks..that way I can get there early, have some fun and then eat around 10ish..more like brunch. Then, no need for lunch, just a midday snack.
Not sure how young your kids are, but they should be fine in a cab without car seats. But, even using a cab, you may find that you can't get in that early in a cab.