There were lots of kids there, and we brought our DS who has great table manners, but they don't have a children's menu and they aren't as friendly to kids as the other upscale restaurants on property, like Yachtsman and California Grille. I think you could say they "tolerate" children.
People were dressed nicely, they definately changed clothes after the park. But I think capri pants and a nice blouse would be fine, dockers and a polo for men.