Sounds about right!
Simple solution - pay attention. I grew up in NYC, we were outside all the time, and the neighbors paid attention to all the kids.
I live in a rural area now, and compared to the cities, very few of the kids are obese. Half the time getting my own 7 year old to come in the house is a major task. It's a mindset. don't let them out and they won't want to go out.....let them out and they won't want to come in. I prefer the latter.