The trailer park manager finally told me to get rid of the jungle. She has been busy down at the owner's other property which is about twice the size of this trailer park and was being poorly managed.
With all the grass and bindweed out(I did convince her that the purslane could stay because it is edible, and little else edible is growing. Her garden is not producing, so she understood) there is lots of lovely squishy mud when wet. First the girls played with fairy toys in the lakes and rivers created by the sprinkler water, when that finally absorbed they dared to investigate the mud. I say dared because DQ was very unsure about it and was surprised I wasn't stopping them. The rinsed themselves off in the sprinkler when they'd had enough.