Preheat your oven to 350 degrees.
Spray two loaf pans with cooking or baking spray.
In a large mixing bowl, combine the flour, sugar, baking soda, baking powder, salt, and cinnamon.
After you have grated the zucchini, grab handfuls and squeeze between your hands to remove as much liquid as possible.
Gently mix the zucchini into the flour mixture – then mix in the grated carrot, and finally mix in the coconut.
In a separate, smaller bowl, combine the eggs, canola oil, buttermilk and vanilla. Stir together.
Stir the egg mixture into the flour mixture, only until well combined.
Divide the batter evenly between the two loaf pans.
Sprinkle the tops of each with about 3 tablespoons of brown sugar and ¼ cup coconut.
Bake for 45 minutes – 1 hour, or until a toothpick inserted into the top of the loaf comes out clean.