I have looked for this information in the past and the replies are hard to come by. We are traveling to the YC in August and this is the best reply I received . . . .
"Over the years, there have been various poolside activities each afternoon. During our last trip, there was a table set up by the pool and each afternoon there was a new activity to be done (such as painting t-shirts, decorating cookies, making necklaces, etc.)"
It seems AKL, Poly & GF have more extensive or at least better known activities for the kids. My understanding is that you will receive information at check in about resort activities. Wish I could be of more help.