Banana Punch with Ginger

4 ripe bananas
2 cups white sugar
3 cups water
46 ounce can pineapple juice
12 ounce can frozen orange juice concentrate
12 ounce can frozen lemonade concentrate
3 cups water
3 liters ginger ale

In a blender, combine bananas, sugar and 3 cups water. Blend until smooth. Pour into a large bowl and stir in pineapple juice. Blend in orange juice concentrate, lemonade concentrate and 3 cups water. Divide into 3 plastic containers and freeze until solid.
Remove from freezer 3 to 4 hours before serving. Using one portion at a time, place slush in a punch bowl and pour in 1 liter of ginger ale for each.