A bit of common sense goes a long ways. If you want to use play equipment for doing your WOD, do it in off-hours. What I do. I wonder if the Bodyweight Culture folks having problems maybe didn't use their heads about when/where to do their stuff.
Sure the equipment's for public use ... but consider who in the public was the primary target for buying the play equipment.
You're the adult - exercise some judgement and all will be well. Doing an intense CrossFit workout in prime-time play hours will intimidate the kids right back to the couch with their GameBoy. Maybe not all of them, but the kids driven away will be precisely the unfit ones who you want to be out there exercising.