I promised a map, to no one in particular. And here it is.
At the end of August, we landed at the airport, which is mostly in Shunyi. We BARELY (and I mean barely barely) drove through Tongzhou, then through Chaoyang and into Haidian, where we live. Two days later we went to church for the first time. Our local subway station straddles a district boundary, so by the time we got on a train, we had entered Shijingshan. We then rode across Xicheng and Dongcheng. That afternoon, my work coordinated a trip to Ikea for all new arrivals, and that took me through Fengtai to Daxing.
On Halloween, my school took us on a field trip to hike around some mountain. On the bus ride home, we barely entered Mentougou (though not as barely as our entering Tongzhou). Then last week my family took the train to Tianjin. We right across Tongzhou, so the brief visit on the way home from the airport no longer mattered. During our three days in Tianjin, we managed to visit all six of the city-center districts.
This data set has some problems. Since Beijing and Tianjin are municipalities that are equivalent to provinces, their districts are equivalent to other provinces' municipalities. Until I get around to fixing this layer, though, it shows province boundaries in bold dashed lines and district boundaries in thin solid lines. This makes it look like the surrounding province, Hebei, has many more top-level divisions than it really has. It's not that big of a deal right now because I haven't been to Hebei yet (though my daughter has, because of Girls Camp), but I don't want anyone (like my wife) to look at the number of divisions shown on this map for Hebei and freak out that I want us to go to them all. China actually only has somewhere around 400 second-level divisions, and I've already been to 18 of them (almost five percent).