Club O2 is the main offering at Carnival for 15-17 year olds. All ships have a dedicated O2 area, and a teen director chock full of ideas on how to make your cruise a little more fun. While amenities on Carnival don’t quite match up to Royal Caribbean, there’s still plenty to do onboard, and Carnival prides themselves on pure fun.
Norwegian is often overlooked. "Entourage" covers teens 13-17 and I really can't say too much about it.
Remember that no matter what ship you pick, it's really just going to depend on who you sail with. Especially between Carnival and Norwegian.
If you want to chat more about it or anything, drop me a message. Also, welcome to the boards
Teen Host Past Cruises CCL:
Fascination (8/26/00) (2/18/02)
Sensation (8/19/12) NCL:
Sea (2/22/03) PCL:
Crown (3/5/11) RCI:
Freedom (3/7/10) Future
Carnival Pride (12/16/12)