Well, I'm 17, so hopefully my insight will be helpful (even if I'm not a mother with a teenager!).
I LOVE going to Universal/WDW with my family...but then again, I'm a certified Disney freak, I live for it. Sweet 16 bash? Nope, not for me, I wanted a week in Disney!
Truthfully, going on vacation to a place like Disney or Atlantis in the Bahamas where I am constantly stimulated and theres alot to do....thats fine. I love those kinds of vacations.
My problem is when we go away with other families. My brother is 14, my sister is 11. Every last one of our family friends have children the same age as my brother and sister. My parents do not have one friend with a girl or boy around the same age as me. I'm bored to death. Usually, I opt to bring a friend or stay home. Truthfully, I don't want to hang out with my siblings and their friends the entire time, and I feel bad invading on the adults. I'm inbetween, and I get kind of lost in the shuffle.