Contrary to what others have posted, PI is not always a good place for children. Pleasure Island Clubs are meant/advertised for adults, not families.
Every night at PI is different. Not all nights are like those described in the above posts, especially if you are there after 10 p.m. Be aware that you may have to leave after a couple of hours or so if you do not want your children exposed to drinking and the behavior that often accompanies it. Those under 18 must be accompanied by a parent at all times while they are there.
That said, many people do bring teens and that is each family's choice to make. Most who do say they choose the early show at the Comedy Club followed by a visit to the Adventurer's Club. They leave after that.
Enjoy your trip!