They will love it! I am "forcing" my older daughter to spend part of our stay at AKL. Though she is an animal lover she actually prefers CSR. Reasons include the pool, slide, playground, sand and hammocks. Both girls love the grounds and the walks to the bus stop and pool. They have taught us to slow down and enjoy the sights, including duscs, birds and whatever little creatures they set their sights on. She also thinks the resort is more "peaceful", though not sure what that means to an 8-year old!
Given the age of your boys I am sure they will love to set out and explore a bit on their own. It is a huge resort! Other plus: there are 2 arcades, one in main building and another by the pool. Just be prepared for them to want to leave the parks early and head back to the resort.