Holland America Line is one of the oldest cruise lines! And has developed over the years into one of the best and one of the most luxurious cruise lines. The food on board is really fantastic and the service is also very good. The ships are beautiful and modern and stylishly decorated, but there are no spectacular activities for children, you will not find any slides on any ship from Holland America Line, they do have children's clubs. The main dining room is very good and the buffet restaurant is also realy good. I would advise you to cruise on the newest ships because the old ships are less beautiful and very old on the inside. I would recommend to take a cruise on the: 

Koningsdam

 Rotterdam

Nieuw statendam