That is awesome. i can't wait for my Alaska cruise this summer.
You will see some awesome stuff. If you like whalewatching, and don't see many close up sightings form the ship, take one of the excursions from Juneau. They only last about three hours and guaranteed to see humpbacks. LINK LINK LINK
We can usually see them from the road north of town any time we drive out.
This post was edited on 3/23 at 7:55 pm