I would say Six Flags is a theme park. We have themed rides like Batman the Ride, Superman, The Dark Knight, and so forth. We also have themed areas. It might not be on the level that Disney is, but I would consider it a theme park.
Kiddieland would be more like an amusement park, but I don't think that makes it a bad park though.
"I've been staring at the world, waiting. All the trouble and all the pain we're facing. Too much light to be livin' in the dark. Why waste time? We only got one life. Together we can be the CHANGE. So go and let your heart burn bright"