Hi zatram, some suggestions,

Switch days 4 & 5, once you get to Seward, do everything you want to there before driving back to Girdwood, it is a long trip.

I've done 3 different day cruises out of Seward they are a lot of fun.

The Alaska Wildlife Center is worthwhile. The parking and access to the Russian River trailhead may be very crowded at this time of year.

Investigate activities and flightseeing opportunities out of Denali, it is 5 hours by car from Anchorage, and private vehicles are not allowed in the park unless you have already obtained one of the randomly drawn permits issued by the park. The park is huge. I would not recommend touring the park and then driving to Anchorage, that will be an extremely long, hard day. I would skip Kenai Fjords NP on day 3 and add that to time in Denali.

If you have not reserved lodging yet, do so soon. It tends to book up. Even in Seward.

Have fun.

You have problems with this plan. You have underestimated your time, needed for Denali Park and have no mention of getting IN the park?? Otherwise there is no use in even using all the time to get there. You need two nights at Denali Park AND the shuttle bus IN to the park to at least Eielson.

So, you may want to consider cutting out a day prior?

In Seward- you mention "Kenai Fjords", are you referring to a boat cruise? Otherwise you aren't going to get into Kenai Fjords.

Prince William Sound boat tours are excellent and very different from Kenai Fjords boat tours. I would instead suggest you consider this your last day. Day trip from Anchorage, could any of the boat tours, and go direct to the airport after a dinner. Could make better use of your time.

I'm assuming you are going in 2012??? You are very late if it's for 2011.