1. In a pitcher, mix pineapple juice, vodka, and lime juice, then chill until cold.
2. Rub lime wedges around rims of 6 martini glasses. Pour sugar onto a large plate. Dip rims of glasses in sugar. Divide vodka mixture among glasses. Push a few pineapple chunks onto each skewer and set one in each glass.
Note: Nutritional analysis is per serving.