Generously grease baking sheet; set aside.
Combine walnuts, cherries, butter, salt and extracts in medium bowl; set aside.
Combine sugar, corn syrup and maple syrup in heavy, large saucepan.
Bring to a boil.
Carefully clip candy thermometer to side of pan (do not let bulb touch bottom of pan).
Cook over medium heat until thermometer registers 300°F (hard-crack stage).
Remove from heat; stir in walnut mixture.
Quickly pour onto prepared baking sheet.
Break into pieces.