We cruised to Alaska last summer for our 20th wedding anniversary. It was a fantastic trip that I'd do over and over again.
We sailed with Princess and were definitely pleased with everything on the ship. I don't know anything about the Holland line.
My best advice on picking a cabin is to get one with a balcony - it's worth the extra cost. We spent many hours sitting on our balcony watching the moutains go by, and when you reach the glaciers, it's a much more comfortable way to see them too. Midship is generally best if anyone suffers from motion sickness too.
We went on a whale watching excursion out of Juneau and saw Humpback whales bubble net feeding. That's an experience I won't soon forget!
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