that's right, I cruised with my son on Sensation in 2007 (he was 14 at the time) nd he wasn't interested in meeting other teens. Other than our excursion, he liked hanging in the cabin watching movies, or in the game arcade, of course.
So be prepared for that. Consider it extra quality time with your child.
We did the Atlantis/Dig tour in Nassau and the glass bottom boat in Freeport.
We loved being pampered, getting room service when we were hungry or thirsty, walking around the ship, looking at the ocean, playing mini-golf, etc... He particularly loved the air-brush tattoos (he got 3 of them).
Or, your child may want to only hang around with other teens. Just make sure to set appropraite stay in touch times (use cell phones or wallkie-talkies for quick less than a minute talks (where are you, ok, make sure to check in with me at such and sucnh time or meet me here at this time.")
Just like at home, you don't know who these other kids are or what trouble they might get your child in.
Have a blast!
After it, you will probably want to do a solo cruise, so you can do all the things that your child may nto have wanted to do when they cruised with you.
After a mom-teen cruise, I'm really looking forward to my solo cruise in March while he's with his dad.