Ski resorts such as Silverton Mountain (Colo.) allow the public to “buy out” the mountain for a day, at a cost of $14,000, with access to a helicopter for an extra $900. At The Hermitage Club in Wilmington, Vt., members can rent the 194-acre mountain for a day for $60,000 and invite 99 friends. The…

An impressive new array of year-found activities at Yellowstone Club is helping this prestigious property bounce back in full stride.