I'm planning on going on an a 7 day Alaskan cruise on the Norwegian bliss. We are stopping at Juneau, Skagway, Glacier bay, Ketchikan and Victoria. I'm saving up at least $500 for 1 or 2 excursions while there. What are must things to see and do over there? Any tips i should know ahead of time? I'm visiting on May 31st and this is my first time in Alaska. :)