Pineapple Mango Rum Cocktails

INGREDIENTS
2 1/2 small ripe mangoes, peeled and cubed (about 2 cups), plus 1/2 mango cut into slices with skin, for garnish
4 ounces best-quality golden rum
4 cups fresh pineapple juice (from a 4 1/2-pound pineapple)
Fresh tropical fruit, such as dragon fruit and star fruit, for garnish

DIRECTIONS
1. Puree mangoes, rum, and 1/2 cup water in a blender.
2. Pour 2 ounces puree into each of six 12-ounce glasses.
3. Fill glasses with ice, and top off with pineapple juice. Garnish with tropical fruit.