This is know as the Twin Valley Trail locally and by the Park. Very nice trail with modest elevation changes, a couple of creek crossings, and some nice views. Great family hike. My wife and I have done it with a two and a half year old and one year old strapped to our backs. Our now four year old had walked most of it on her own two feet. Most of it is under tree cover so a good hot weather hike.
Plus, you get the Arc monument, so an interesting bit of history/geography thrown in.