The church I serve has this half court in the back parking lot.
It's a simple, relatively inexpensive, and passive community service. Most every Saturday there are games going on out there.
We also have some lovely green space in an area that's quickly reaching saturation--plenty of neighbors walk their dogs here, or just take themselves for a walk around our gardens. We recently added a Little Free Library, because let's face it--we all have too many books.
What are the easy and passive ways your congregation can serve the community, simply by sharing what you already have?