A public park is a backyard the whole town shares. Somebody decided that land should stay green for you.

A park is expensive land somebody decided should stay open to everybody. Behind it sits an old choice not to build there, kept in place by people who mostly did not live long enough to use it themselves. The sharing runs so smoothly that it looks like nature instead of a decision. You inherited a backyard you never paid for.

Use one this week for something you would normally do indoors. Study, eat, meet a friend, lie on the grass for an hour. Then leave it tidier than you found it, which is the only rent the arrangement asks.