Preheat oven to 350 degrees F. Coat two 8- x 4-inch loaf pans with cooking spray, then dust with flour.
In a large bowl, combine flour, sugar, baking soda, cinnamon, and salt; stir in macadamia nuts. In a separate bowl, combine remaining ingredients; mix well. Pour wet mixture into dry mixture, stirring just until dry ingredients are moistened. Spoon batter into prepared loaf pans.
Bake 1-1/4 to 1-1/2 hours, or until a wooden toothpick inserted in center of loaf comes out clean. Cool in pans 10 minutes; remove from pans and let cool on wire racks.
In a small bowl, combine confectioners' sugar and reserved pineapple liquid. Drizzle over cooled breads.
