• Sport and art
• low cost and free places to do sport and art
• linked together by public transit and clean, safe places to walk, run or cycle (or scoot or skate or whatever)
• a shorter working week, so people have time to do the above
• a higher minimum wage, so people can afford the (ideally low, if necessary) costs involved

So, e.g., lots of parks with publicly accessible five-a-side football pitches, ping-pong tables, basketball courts, skateparks whatever - that's your sport. The parks also have bandstands or outdoor theatres, where there's space for that.

Public libraries with rooms people can hire (or use for free) for book clubs, sewing circles, art classes - that's your art.

Good thing about the above is that all these ideas already exist in lots of forms, you just pick whatever works best for your current situation.