Alaska is a big state (I know, duh) but I mention this because it might be advantageous to move Basecamp each few nights to get a true benefit of the area.
We typically have a few nights in Anchorage, then move base to Soldotna for fishing. Soldotna is "close" to Homer and Seward yet those drives are hours away, even further from Anchorage.
For that amount of time, I would suggest a few nights near Denali first (furthest north popular area), a few nights in Anchorage, then pick a spot in Seward, Soldotna, or Homer for a few nights. That allows them to drive back into Anchorage for their flight back, which is typically a super late or early departure time, and maximize their time.
Lot of activites and sunlight to do whatever they want. I have done hikes starting at 9PM and finishing by 11PM with sunlight the whole time.
Oh yeah, make reservations early! Things fill up fast, including rental cars, and they will be equally expensive.