And in terms of playground surfaces and sitting on park benches, it sounds extreme, but we do know that it lives on surfaces for a long time—some studies have found nine days, some studies have found three days—and we don’t clean those surfaces regularly. You will want to not touch those surfaces.
Results from new studies reported in livescience.com say they can't determine if breathing is a transmission possibility so I will leave it for a week to see if something new comes out.
I did some Googling and found that just breathing on someone doesn't transmit it. It has to be a cough, with the droplets landing in the eyes, mouth or lips.
Any surface that the cough lands on will be infected for hours.
But the above does not explain why asymptomatic people could spread it, unless they touch their eyes, mouth or lips then touch yours or a surface. No one has figured out yet if asymptomatic people can spread but their touching of eye, mouth or lips must be the method that researchers are studying.
Social distancing seems to mean 6 feet from most of what I have been reading.