Pineapple-Orange Margarita recipe

2 1/2 cups pineapple juice
1 1/4 cups white tequila
1 cup Cointreau or other orange liqueur
1 cup orange juice
3/4 cup fresh lime juice
1/2 cup simple syrup
3 cups ice cubes

Optional garnishes: fresh pineapple spears, maraschino cherries
Combine pineapple juice, tequila, Cointreau, orange juice, lime juice, and simple syrup in large pitcher. (Can be prepared 6 hours ahead. Refrigerate.) Add 3 cups ice cubes to pitcher and stir to blend well. Pour margarita into cocktail glasses. Garnish with pineapple spears and maraschino cherries, if desired, and serve.