Preheat oven to 350 degrees F. Coat a loaf pan with baking spray, or lightly butter and dust with flour. I also recommend putting a strip of parchment paper in the loaf pan to make for easy removal.
In a large bowl, combine flour, sugar, baking soda and salt. In a separate medium bowl, combine eggs, vanilla, vegetable oil, banana and pineapple; mix well. Add wet mixture to dry mixture, stirring just until batter is moistened. Stir in chopped nuts. Pour into loaf pan.
Bake for 1 hour, or until a toothpick inserted into the center comes out clean. Allow bread to cool in pan for 10 minutes before removing to a wire rack.