The walking pathway between CCV (WL) would be the most peaceful, but it’s been closed since they started construction on Reflections. I don’t know if it’s been reopened now that DVC has shelved that project.
I find SSR and OKW to be equal when it comes to relaxing walking. There’s a paved pathway that connects the two resorts which takes about 20 minutes from Carriage House to Pennisular Road.
From SSR or OKW, you can walk around Disney Springs and even down Hotel Plaza Blvd. You could do a couple of miles and only stop at the intersections or climb the stairs to the overhead walkways around Disney Springs. You just need daylight to do the path from OKW to Disney Springs/SSR.