Your child should enjoy both pools. I also think that the "sweet goodnights" program and the "unbirthday party" should go over very well with that age group. The resort is small and should provide you with wonderful memories. It is my understanding that all studios are in the main lodge, so you won't have very far to walk to any of the activities. Enjoy your trip!
Don't forget sunscreen for the little guy. When our kids were little we brought one of those "off-road" type strollers for the beach!The sand is quite well packed on the beach so it won't be too difficult to manage the stroller and he will have a place to take a break. He will have fun chasing seagulls and getting his feet wet in the ocean!