We leave next friday for our Alaska cruise on the Diamond. In 2000 I cruised to Alaska on NCL. We have not taken our DDs yet because they are pretty young. I really think you cannot go wrong with an Alaska cruise because visually it is awesome. Most cruiselines even offer excursions geared towards families with children. Take a look at the cruise critics message board, under Ports of call, you will get some great info from the Alaska Board.