Prepare pie shell In small bowl of electric mixer, beat the cream cheese until light and fluffy. At low speed beat in eggs and cinnamon sugar until smooth. Pour filling into the pie shell and bake for 30 minutes at 375. Cool completely on a rack. Wash and peel peaches. Halve peaches, remove pit and slice them. Arrange over cooled filling. In a small saucepan heat the peach preserves and the Grand Mariner, cook and stir until melted. Press this mixture through a sieve and spoon glaze over the peaches. Referigerate until ready to serve.