We have three boys (ages pre-school to pre-teen) and we love the pool at the Beach Club/Yacht Club. Follow the link in my signature below for more information!
Our second favorite resort pool is the Kidani Village and AKL pools - both are available to guests of both Kidani and AKL. The Kidani pool includes a fun waterslide, mini waterslide for smaller kids, zero depth entry and an entire splash pad/water play area!