This cracks me up. What do people want to do when they go on vacation??? If these teens are going on a cruise what are they expecting to do? My teen had been twice and both times she barely spent any time with us. She never complained about having nothing to do. If your child is not very social, I can see a problem. Mine doesn't have many friends at home but this cruise was great for her. She was able to just let go and laugh. Hanging out in the sun and talking is what teens do best. To be young again!!!!!
We once cruised with 11 in our party (ages 8-60ish). I made most of the pre-arrangements. Once on the ship I stopped planning. Leave people to make their own arrangements. My plan was to try and have everyone meet up for dinner. You're not responsible for everyone in your group having fun. Leave the fuddys and complainers to make their own good time! Believe me - there's plenty to do if they want to do it...
Kim