First of all, while much media hyperbole surrounds Government shutdowns, much like the debt ceiling, there is a long history of shutdowns going back to the 70s.

Source: https://seekingalpha.com/article/4638825-government-shutdown-averted-but-is-that-a-good-thing?source=feed_all_articles

Government shutdowns aren't terribly rare, but most of them don't last more than a few days.

Source: https://realnewsmontana.com/ixp/13/p/what-happens-to-national-parks-in-montana-during-a-government-shutdown/

Government shutdowns are very confusing events, and it's not always exactly clear what happens with things like National Parks.

Source: https://realnewsmontana.com/ixp/13/p/what-happens-to-national-parks-in-montana-during-a-government-shutdown/