Per the SF mayor's press conference, I think it means giving people walking around outside a talking-to, up to and including a misdemeanor (though they stressed that they don't want to just start handing out tickets, and would prefer to start with "education").
They're obviously not being hardasses about it, as doing so is precluded by the "essential activities" loophole; if you're on your way to something frivolous, you can just tell a cop you're going to the grocery store or pharmacy. But it prevents people from doing things that are obviously non-essential, like hanging out with each other in the park (or going to destinations like gyms that are now effectively required to be closed).
They're obviously not being hardasses about it, as doing so is precluded by the "essential activities" loophole; if you're on your way to something frivolous, you can just tell a cop you're going to the grocery store or pharmacy. But it prevents people from doing things that are obviously non-essential, like hanging out with each other in the park (or going to destinations like gyms that are now effectively required to be closed).