I have done Alaska twice with Princess. But, I am sure that the tours are similar.
Juneau the Mt. Robert Tram ride is excellent for picture taking, weather permitting.
I have done both land tours of Mendenhall Glacier & the salmon hatchery and the helicopter/glacier tour. I highly recommend the helicopter. It was awesome. Be sure to visit the Red Dog Saloon.
Ketchikan I did the Misty Fjord Seaplane ride. Excellent. Lots of shopping right near the pier area.
Skagway the train ride is #1. White Rail Pass. Be sure to bring plenty of film!!!
Save some time to walk downtown. It is lovely.