I was wondering the same thing. I also live on a cul-de-sac and there are children living in practically every house, including my son. They play outside together almost every day, riding skateboards and bikes, building "forts" with odds and ends from each kids garage, and doing general kid things. When it gets hot out (I live in Florida) I set up the sprinkler and let the kids run around in my backyard. Of course, all this outside play for this group of kids leads to the flip side of the story, neighbors who complain about kids "running wild" through the neighborhood. The people who have the types of beautiful gardens the author described also put up little reflector lights on poles so people won't get too close to their lawns, and hover behind their curtains spying on the kids so they can catch them sneaking an orange from their yard. So you can't win. The kids are either lazy drones hooked up to Wii all day, or wild savages running amok in suburbia.
And regarding playgrounds, we also have some amazing play structures at our public parks. We don't have monkey bars on gravel, but we have rock climbing walls, giant sprial slides, play structures shaped like a pirate ship, spinning rides, tire swings, and all kinds of opportunities for playground accidents the experts say I am so concerned about (even though I have never witnessed any sort of playground tragedy). But there are also some parks, even some in good neighborhoods, where people go to do their naughty business. Even at my playground, in a great suburban area where you might find a dozen young mothers with their babies at the weekly mom's group meeting lounging on the swings, I have found used condoms by the play equipment, found evidence of drug use in the parking lot, and seen some guy who appeared to be meeting up with a prostitute during his lunch break. It is kind of creepy to know that the park where my kids play is the park where John Smith meets his prostitute on his lunch break.