Priscilla,
I love boat excursions, but will be on the sea plane for Misty Fjords instead of going on the boat. I did a little research on CC and found that generally people feel the plane is the better of the two options.
Lee,
Looks like a few excursions are not offered on our cruise. I wanted to do a dogsledding one, but it seems the last time it's offered is in August. Not sure what to think about the Tracy Arm excursion. As of now, the website lists it but says, "The Shore Excursions below have been offered in this port in the past, and are generally confirmed for future sailings 120 days before the cruise begins."
The White Pass railroad is probably the thing to do in Skagway. I've read that siting on the left side is best for the views.
Kim