3) dog sledge or whale watching
In Juneau there are two options of the most popular activities, dog sledging and whale watching. Dog sledging is the most popular one but it is not advisable to do it when it is raining and foggy because you can see nothing. Also, it is always good to book it in advance because it gets overly booked. If you take the plane, you can stay overnight and do both, sadly not by cruise. Whale watching has guaranteed whale sightings.