Make sure you get to Seward and the Alaska Sea Life Center. It's a fascinating place. Also, make sure you get out on a boat into the bay to see the whales and other animal life.
I know Denali has to be on your itinerary. Try to stay out at Kantishna. If the farthest point in Denali that you can go and the closest point to the mountain.
Enjoy! Alaska is an amazing place.