You are in for a great trip. I have been to DNP three times since '98 & have a few ideas.
Your only view of McKinley (if visible at all) from the south to my knowledge is from the Parks Highway as you travel N. from Anchorage.
Almostly directly east of this point is Denali STATE Park. In this state park, climb Kesugi Ridge Trail for some of the best views. This is where I will be backpacking in August.
Denali is great for wildlife. If time allows, get off the bus & walk the road sometimes. I spent a week at Wonder Lake & road the buses every day to new locations.
Katmai NP- when & if the salmon are running while you are there. This is the place to safely get frame filling photos of brown bears salmon fishing, etc.
On the Kenai-Kenai Fjords NP. Take a boat out of Seward for whales, otters, seals; & visit the Sea Life Center at the end of town. Visit Exit Glacier just before Seward & climb up the trail for Mountain Goats.
And look here-
http://www.us-national-parks.net/state/ak.htm