Wednesday is Open House day in Jackson Hole, and many were in South Park, where there is a heavy concentration of horse properties. Jackson Hole real estate activity Huge OPEN HOUSE day with about 20 on the list. I made it to about half those, focusing mainly on the South Park horse properties, 3 Creek Ranch and Melody Ranch. NEW: 3-bed, 3-bath, 2,408-square-foot home on the eastern flanks of Snow...