I've been following postings to the HollandAmericaBlog by a family from the Netherlands on the Niew Amsterdam doing the Venice / Greece thing. I was surprised to read that there are 350 children on this trip . . . the most children I've ever seen on a HAL ship was maybe 50 in the Caribbean ~ These Dutch children are older than your son - but seem to enjoy their Club HAL time.... I will also say that most children I've observed on HAL cruises are always such good travelers - regardless of their age. Well behaved at dinner and in the show room and around the pools. You, of course, know your child best - but it seems like the HAL cruise for more days would be a very good deal . . .