1. Join a dedicated family cruise
Some ships organize dedicated family departures, usually coinciding with northern hemisphere school holiday periods - Christmas, March break, summer vacation.
Joining a dedicated family departure means that your naturalist guides will be primed to adapt the delivery of their messages to a younger clientele, and will also engage them in more young spirited activities when opportunities arise.
On family dedicated cruises, you'll be sharing the experience with other families, and your children will most likely engage with other children in their age range, freeing up parents to enjoy some time among adults as well.
A very few ships try to go the extra mile, organizing family departures specifically targeting either teens, or children under 12, in an effort to ensure a good age-range match on board.