As a distance runner, I'm constantly out training in nearby parks and forest preserves. I went out today to check out a new area and I have to admit I was genuinely surprised by the number of people there. Like the lot was at least two-thirds full... an uninformed individual would never suspect that there's a pandemic sweeping through the country from that scene.
On the flip side, I imagine that the risk of contagion at preserves is somewhat lower, simply because outside of the parking lot, you're much more spread out. If hobby-jogging or family walks serve as an outlet to prevent other, more rash behaviors, then I suppose it's a good thing.
Side note: I wonder what effect wind speeds have on an airborne disease's ability to spread. It would be interesting to see what sneezes/exhalations look like on a windy day like today versus, say, in a supermarket.