Good and safe fully fenced playgrounds away from cars are important - both open-air and closed for the rainy/snowy days. So a bunch of families can leave there children and even a single parent can look after them for an hour or two. Children like playing with each other, just make it available, so the parents can read a newspaper/work on their Macbook without being scared to look away from their child for a minute.

Same thing with kids rooms in cafes/restaurants/public places - they should be mandated by state for big establishments