For a group of teenagers, maybe Tortilla Jo's would be right up your alley? Mexican food in a casual atmosphere....would sound good to me if I were with a big group of friends!
Jazz Kitchen might be verging on "stuck-up" for a large group of teenagers. Also verging on a little pricey, depending on your budget.

But it is a really really excellent restaurant!
I'd recommend looking into Tortilla Jo's or Rainforest Cafe and seeing how they accommodate groups of your size.
I really do think Goofy's Kitchen would be the most fun though!!
