https://www.mercurynews.com/2020/03/19/coronavirus-is-it-legal-to-go-hiking/

Fitness centers, gyms, golf courses, public pools, zoos and campgrounds across the Bay Area area are closed.

But as millions of people remain confined to their homes due to the coronavirus — often with children home from school — there has been broad confusion about whether it’s legal to go for a walk in parks to get relief with fresh air and exercise.