Public green spaces are good for the immune system and the mind—and they can be rationed to allow for social distancing. --- Mental health is also a crucial part of the resilience we need to fight this pandemic. Keeping people’s spirits up in the long haul will be important, and exercise and the outdoors are among the strongest antidepressants and mental-health boosters we know of, often equaling or surpassing drugs and/or therapy in clinical trials. […] If pandemic theater gets mixed up with scientifically sound practices, we will not be able to persuade people to continue with the latter. […] Even if health authorities close some parks temporarily while they assess and develop evidence-based policies and best practices, they should do so with transparency and a timeline or conditions under which the parks will reopen. That’s the best of all possible worlds: The authorities will preserve much-needed legitimacy, and the public will retain access to the outdoors under sensible conditions that reduce risk while promoting health, well-being, and resilience—and we will certainly need all of that to get through the next many months.