Preheat the oven to 350 degrees F (175 degrees C). Grease three 8x4 inch loaf pans and set aside.
In a large bowl, whisk together the eggs, honey, brown sugar, oil and vanilla. Combine the whole wheat flour, all-purpose flour, cinnamon, baking powder, baking soda and salt; stir into the wet ingredients until moistened. Gently stir in the zucchini and walnuts until evenly distributed. Divide batter evenly between the prepared pans.
Bake for 50 to 60 minutes in the preheated oven, or until a knife inserted into the crown comes out clean. Cool in the pan until cool enough to touch, then turn out onto a wire rack to cool completely. Wrap in plastic wrap or store in a plastic bag when cool.
