Combine sugar and water in a saucepan.
Set over low heat and stir until sugar is dissolved.
Increase heat, cover, and boil 5 minutes.
Remove from heat; set aside to cool.
Combine in a large bowl the tea, pineapple juice, lime ice, and orange juice concentrate.
Stir to blend ingredients.
Chill in refrigerator.
When ready to serve, pour chilled fruit juice mixture into a chilled punch bowl.
Pour in the sugar syrup and chilled ginger ale; stir to blend thoroughly.
If desired, a decorative ice block may be floated in the punch.