In a large bowl, combine the flour, sugar, cinnamon, baking soda and salt. In another bowl, combine the eggs, oil and vanilla. Stir into dry ingredients just until moistened. Fold in the bananas, coconut and pineapple. , Fill greased or paper-lined muffin cups two-thirds full. Sprinkle with nuts. Bake at 375degrees for 18-20 minutes or until a toothpick comes out clean. Cool for 5 minutes before removing from pans to wire racks. <br><b>Freeze option: </b>Freeze cooled muffins in resealable plastic freezer bags. To use, thaw at room temperature or, if desired, microwave each muffin on high until heated through, 20-30 seconds.