Pineapple-Cinnamon Margaritas

In a small bowl mix sugar and cinnamon until combined. Place sugar mixture on a small plate. Rub rims of eight glasses with lime; dip rims in sugar mixture.

In a pitcher combine Triple Sec, tequila, lime juice, and sugar. Stir until sugar is dissolved. Add pineapple juice to tequila mixture and stir. Chill until ready to serve.

Place ice cubes in sugar-rimmed glasses. Pour tequila mixture into prepared glasses and garnish with cinnamon sticks, if desired.