Tropical Sherbet

Combine sugar and 2/3 cup water in a microwave-safe dish; microwave at HIGH for 4 minutes. Stir until sugar dissolves; cool completely. Combine syrup, pineapple, and remaining ingredients in a blender; process until smooth. Strain mixture though a fine sieve over a bowl; discard solids. Pour into the freezer can of an ice-cream freezer; freeze according to manufacturer's instructions. Spoon into a freezer-safe container; cover and freeze 2 hours or until firm.