Well of course there is no "one size fits all" solution. Where there is space for sidewalks, bike lanes beside the road and an adequate amount of greenery/trees

Well of course there is no "one size fits all" solution. Where there is space for sidewalks, bike lanes beside the road and an adequate amount of greenery/trees, that's the way to go (even if it means sacrificing some parking space or a car lane); where there is not enough space, either create a "shared zone" where all vehicles are limited to walking speed, or convert it to a pedestrian area.