Newer homes tend to have better park infrastructure in my experience.
From what I've seen, there may be parks, but they rarely seem to be walkable, and if they are, they're just a swing set (and not a full field with room for older kids to run). Lots of disjointed sidewalks, where the developer put sidewalks in/around the cluster of homes, but failed to link it anywhere useful.
It really depends who the developer is trying to sell to. There are properties being developed around here that would bog down an invading army, and there are others that are clearly developed for seniors, and some that are obviously aimed at families.
The latter two often are quite walkable and even advertise it as a feature. It depends on what is selling.
As house prices level off, expect to see developers throw more money at things like walkability and parks, as they hate to ever have to reduce prices in a development or an area, and would rather "throw more on".
From what I've seen, there may be parks, but they rarely seem to be walkable, and if they are, they're just a swing set (and not a full field with room for older kids to run). Lots of disjointed sidewalks, where the developer put sidewalks in/around the cluster of homes, but failed to link it anywhere useful.