Happy Camper - there were many kids on this cruise. The children's program on Princess is really well run - I do know that one night they had a pool party for the kids. There are kids menus on the ship.
There are lots of water sports available in all the ports, horseback riding in PV and Maz, lots of places to go to the beach, jungle canopy adventure in PV. Lots more - I just can't remember them all.