In exploring my own neighborhood, I made the discovery that in addition the named playgrounds that appear on most maps (including Google Maps), there’s a few small playgrounds, situated in the open voids between houses backyards. I found these and mapped them after taking my girls to go play there:

osm.org/#map=18/43.01846/-89.50666

From the aerial photographs, it looks like there’s more in the neighborhood, so now I’ll have to go exploring!