We stayed at the AKL last summer. Our boys (ages 9 and 7) enjoyed the pool/water slide and the playground area. Also, when you check in, you will get some checklists with the names of the different birds and animals in the savannahs. Our boys had a good time going to the different viewing areas and trying to figure out what animals they had seen and checking them off their lists. There is an arcade if the kids like games and storytelling around the outdoor firepit each night. Others may be aware of some other activities available to children--these were just some that my two boys enjoyed.
Have a great trip. The AKL is a beautiful resort and I look forward to staying there again someday.
Dizneyfan