A culture where adults also go to playground and play with each other.

Cities should be able to build city playgrounds, where adults in all ages should be able to come and play with each other.
Everyone knows how good it is for children to play with each other, but why are we as adults not playing together, when we tell our kids to do it?
Trough playing together adults will be social and build up new network while being healthy and exercise with other.
Cities should therefore be able to build playgrounds where adults can play with each other or play with their kids. They should be build with the citizens, so they could figure out, what everyone want.