In a large pitcher, combine orange juice, pineapple juice, and ginger. Cover and chill for 2 to 24 hours.
Strain mixture; discard ginger and pulp. Slowly pour ginger ale into juice mixture.
Serve over ice in chilled glasses. Garnish with orange slices.
Tip: Dress up the punch with citrus ice cubes. To make these decorative cubes, fill the compartments of an ice-cube tray with lime, lemon, and/or orange slices (halve or quarter slices to fit). Fill with water. Freeze until firm.
Note: Calories: 48, Total Fat: 0 grams, Saturated Fat: 0 grams, Cholesterol: 0 MG, Sodium: 22 MG, Carbohydrate: 12 grams, Yield: 12 Servings, Amount Per Serving: 6 ounces, Preparation Time: 20 Minutes, Chill Time: 2 to 24 hours