Margaritas: Rub rims of 12 glasses with lime wedges. Dip rims into sugar.
Combine 1 1/2 cups sweet-and-sour mix, 1/2 cup tequila, 6 tablespoons papaya
nectar, 6 tablespoons guava nectar, 1/4 cup cream of coconut and 8 ice cubes
in blender. Process until blended. Pour into 6 glasses. Repeat with remaining
sweet-and-sour mix, tequila, both nectars, cream of coconut and ice cubes. Pour
into 6 glasses. Garnish each with lime slice.
Homemade Sweet-and-Sour Mix: Combine water and sugar in large saucepan.
Stir over medium heat until sugar dissolves. Bring to boil. Cool syrup.
Mix syrup, lemon juice and lime juice in pitcher. Chill until cold. (Can
be made 1 week ahead. Cover; keep chilled.)