Teton Pines has opened its Arnold Palmer-designed golf course for the season. Today’s Jackson Hole real estate activity: NEW: West Jackson duplex with two 3-bed units built in 1977, listed by Engel & Volkers for $1.195 million.NEW: East Jackson 4-bed, 1,859-square-foot home built in 1978, listed by Prugh Real Estate for $1.095 million.NEW: Downtown Jackson penthouse condo atop Marriott with...