Arriving in Anchorage Aug 17 night and will rent a car to head towards Denali. Spend a couple of nights there before going back down on Aug 20. Then I'll use the two days before my Aug 23 cruise boarding to explore Seaward. I'm interested in hiking the Exit Glacier and Harding Icefield as well as a trip into the Kenai Fjords. In this case, do you suggest I keep the rental car for the last two days or return it in Anchorageand take a train down to Seaward? Not sure how easy or hard to get around Seaward and cover my points of interest. Also not sure if I get the best scenery on the Seaward hwy or railroad. A lot of people,talk about Turnagain. If I take train to Seaward, should I drive to Turnagain before return the car?