Chill ingredients. Mix pineapple, grapefruit and cranberry juices in a chilled punch bowl. At serving time, slowly ... cubes. Add dark rum, if you like. Makes 21 cups or 40 servings.
In blender, puree thawed strawberries ... smooth. In large punch bowl, combine strawberry mixture, cranberry juice (and rum, if desired). Just before ... Makes about 4 quarts.