In a small pot over medium heat, mix together the sugar and pumpkin pie spice with 1 cup water. Bring it to a boil, remove from the heat, and allow to cool for 1 hour. The syrup can be stored in the refrigerator for up to 2 weeks.
To a pitcher, add the vodka and half the simple syrup. Stir until blended. Add the cranberry seltzer and pour into chilled martini glasses. Add more sugar syrup, to taste, if necessary. Garnish with maple candies, if desired.