text: The last good reason is that you could clean up your parks and your state parks. It is a very important reason you should keep your parks clean because people would not want to come to a park that is all dirty and probably stinky. Also people would not want to come to a state park that is popular that is gross and full of trash. So people has to clean up every where to keep states or probably the United states clean. One more thing it also important to clean up lakes and polluted areas so when people swim no bad stuff would happen.