It was such a cool experience for them. My older son did a ton of calling and on the second day they needed a little more persuasion to come in. My buddy that we were visiting let my son do it all giving him some pointers. It was really cool (confidence builder) for him.
My younger boy said that it was the best trip he had ever taken in his life, "better than California". We all laughed and said, "better than Disneyland?"
My older boy replied, "This is the happiest place on earth!"