My boys are 12 and 14 and we just got back from HRH last week.
Seems like that was the most popular age group while we were there!!
My boys played at basketball hoop in pool every day. It was fun to watch them interact with other kids they did not know. They are all so very much alike!
Lots of kids were using the slide at pool again & again. There is also a pool table & foozball game by the pool. My sons never did make it into the arcade.
I did not notice any "organized activities" happening. We wouldn't have had time for them anyway!