Just an early morning adder to this thread...
1) I'd strongly agree with what Joe b. posted....if you stay on the road, you'll see 10% or less of Alaska. Line up some flightseeing, some riverboating, something other than the driving.
2) Hard to explain, but IMNSHO, being in Alaska has a special kind of ambience that is of course related to the scenery, wildlife, etc, but is also more than the sum of its parts. IMNSHO, the more rigorous one gets about itinerary and schedule (except the bare minimum), the less chance that a visitor has to feel and experience that ambience.
I'd recommend making a bullet list of things you don't want to miss rather than a detailed itinerary.
