For syrup, in a saucepan combine grapefruit juice, sugar, and cinnamon.  Bring to boiling; reduce heat.  Simmer, uncovered, for 5 minutes.  Discard cinnamon; cool syrup.  Cover and chill syrup.

 

To serve, fill four 8 oz glasses with ice.  Add about 1/3 cup grapefruit syrup to each glass.  Fill glasses with ginger ale.  Stir gently.  If desired, garnish with Florida grapefruit peel curls, edible flowers, and fresh mint springs.