Pineapple Gin Punch

This punch is perfect for a holiday party. Add a fresh sprig of rosemary to make it festive.
1 cup water
1 cup sugar
1 tablespoon finely grated lime peel
2 cups pineapple juice
2 cups  gin
2 cups seltzer
1/4 cup tablespoons fresh squeezed lime juice
several dashes of teaspoon orange bitters
1 large pineapple  cut into  1/4 inch pieces (peeled and cored)
1 Block of ice or ice cubes

Mix sugar and water in a saucepan and reduce on medium heat to a nice simple syrup.  Let cool. Add all ingredients in a large pitcher. Pour into a bowl with ice. Garnish with a sprig of rosemary and a few cranberries to make festive for the holidays.