Carnival does not have as many of the extra items onboard like surfing, rock climbing and zip lines. Also there are not the "name brand" places like Johnny Rockets. Depending on the kids on board they do seem to try to keep everybody active and give teens opportunities to meet their peers on board.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014