It's not too busy on the Jackson Town Square in mid-April, which makes for a great stroll on a warm spring day. Today’s Jackson Hole real estate activity: NEW: Ponderosa Village 2-bed, fully upgraded condo built in 1976 that won’t be in MLS until later this week, listed by Jackson Hole Sotheby’s International Realty for $379,000. NEW: Rafter J 4-bed, 2,591-square-foot home on .22 acres built...