For the simple syrup:
Bring 3/4 cup water to a boil. Dissolve 1/3 cup sugar into the boiling water. Once the sugar is dissolved completely, remove the pan from the heat. Allow to cool completely and bottle.
For the infused vodka:
If possible, infuse the vodka by combining it with the pineapple in a jar. Tighten the lid securely over the jar and place in the refrigerator or at room temperature, away from direct sunlight.
For the party:
Combine the infused vodka (including the pineapple chunks), simple syrup and fresh pineapple juice in a punch bowl. Serve individually over ice and enjoy!