Eureka!!! After watching that vid again and again I noticed that boat name is called "Glacier Jet." They depart daily from the Knik River which is where I found the image of the Port of Anchorage. Also...here's a big one, "Transportation [to the Glacier, possibly may be Matanuska] is provided from the Alyeska Prince Resort in Girdwood upon request only." This is the place where some people had made assumptions of where they are at. I think it all ties in b/c the glacier climb (assuming it is Matanuska), the walkway over mud flats overlooking the Anchorage skyline, and the Alyeska Resort are all relatively near each other, probably about <100 miles, which is no more than 2.5 hours by taxi. I am assuming should they be at the Alyeska Resort, their next possible clue may be to get to the glacier place, and climb.
...Just my opinion.