A car-free town in Italy. It is a tradition that at 4 p.m. everyone comes out on the streets and walks. People connect. In this one, the baby is locked on the face of the woman talking. This is how babies learn, by observing adults. Three generations together. Why, because the elder lady does not need to drive in a car-free town.
One grass hill, a recycle bin of nearby cardboard, add children. When older, provide space for children to connect... on foot or bike, not driving. Provide opportunity for the elders to connect with the young and pass on their knowledge. And ensure they have entry-level jobs to become participating, productive members of society.
More outdoor furniture - in this case, where the old men gather in the warm evening.