We just took the HAL cruise on the Amsterdam to AK this past July. Alaska was indescribably beautiful. The excursions were expensive but if you work at it, you can choose very good ones that are worth the price. We did white water rafting(great but cold).
Nature cruise (we saw more in an hour and a half than we did the rest of the cruise
eagles, bears, whales, sea otters.
Kayaking, too rushed and wouldnt recommend it.
The cruise itself
HAL does the best at embarking and disembarking
period. We experienced no waiting in lines, thank you HAL.
In my opinion the ship does not compare to
DCL. The ship looks nice but the details are just not there. Our daughter is a teenager, I would expect that younger kids would get bored between stops. The food and service on the three DCL cruises we took were much better than what we experienced on our HAL cruise.
Its cold up there, you wont have too much need for summer clothes.
I would do it again anytime. The beauty of Alaska is so great it overshadows any deficiency I may have felt in my comparison between HAL and DCL.