Combine the wine, Simple Syrup, orange juice and rum in a pitcher. Add the raspberries and peaches and stir. Chill, covered, at least 1 hour and up to 24. Serve over ice. Add a peach slice and mint for garnish and enjoy!
Combine the sugar and 1 cup water in a small saucepan and bring to a boil. Cook, stirring, until the sugar dissolves. Remove from the heat and let cool completely. Keep covered in the refrigerator up to 1 month.