Creating Hawaiian Carrot Pineapple Cake is straightforward. Follow these steps for a delicious outcome:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking soda, baking powder, cinnamon, nutmeg, and salt until well combined.
3. Combine Wet Ingredients: In another bowl, mix the vegetable oil, eggs, and vanilla extract, beating until smooth.
4. Add Carrots and Pineapple: Stir in the grated carrots, crushed pineapple, shredded coconut, and chopped walnuts into the wet mixture.
5. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
6. Divide Batter: Pour the batter evenly into the prepared cake pans.
7. Bake: Place in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
8. Cool: Remove from the oven and allow the cakes to cool in their pans for 15-20 minutes. Then, transfer them to wire racks to cool completely.
9. Frosting (Optional): Once cooled, frost with cream cheese frosting or your favorite frosting, if desired.
10. Garnish (Optional): Top with additional chopped walnuts or coconut for a beautiful finish.

These straightforward steps will guide you in creating this incredible cake effortlessly.