Kayla Jean Ricci Dog Park in North Kingstown. It's at the end of Quonset. I only go down there to do wildlife photography - as I like the relative isolation - but I rarely see more than one or two people in the dog park later in the day. It's a very quiet, scenic area. If on a leash, you could also take them to Spink Neck Beach. It's has enough parking of its own, but is also a very short walk from the Dog Park. A pretty good stretch of sand that typically isn't too active, in my experience.