In a small saucepan, bring sugar and water to a boil; cook and stir until sugar is dissolved. Cool completely., Puree watermelon in a blender. Transfer to a large bowl; stir in sugar syrup and remaining ingredients. Refrigerate until cold., Pour watermelon mixture into cylinder of ice cream maker; freeze according to manufacturer's directions. Transfer to freezer containers, allowing headspace for expansion. Freeze 4 hours or until firm.