Every city has many theme parks, the local people like to go to the park for a walk or take some exercise.
In China, most parks are free, people can go there without charge, but still some other parks need to charge.
People urge that all the parks should be free, while I think it will do harm to the park.
One the one hand, opening the parks for free encourages people to go to the park for entertainment.
Most people have the habit to take a walk after dinner, so it can help them to keep their bodies healthy.
The children can have fun with their friends, too.
The parks provide people so much fun, so it is good for people to go to there for free.
On the other hand, too many people go to the parks will do harm to the environment.
Some people will throw away their trash away, the environment will be polluted.
Whats more, the crowed people will make people have less space for them to have fun.
For me, I think it is not good to open the parks for free, it needs to control the number of people, so we can protect the environment.