From the North:

Take Route 5 & 20 to State Route 14A.  Take 14A South through Hall, Benton, village of Penn Yan.  Continue 14A South to Mac's Dairy Bar on the left, just past Friendly Dodge Chrysler Jeep.

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From the South: 

Take Interstate 86 to State Route 14.  Take 14 North through Horseheads, Watkins Glen.  Exit onto State Route 14A North toward Dundee.  Take 14A North out of Dundee toward Penn Yan.  Mac's Dairy Bar will be on the right, just past the Milo Center rest stop.