Preheat the oven to 350°F. Spray a 10-inch bundt pan with flour-based baking spray.
In a large bowl, whisk together the flour, sugar, baking soda, and cinnamon. Set aside.
In a medium bowl stir together the bananas, oil, pineapple, and vanilla. Stir into dry ingredients, just until combined. Fold in the walnuts and coconut.
Pour into the prepared bundt pan. Bake for 1 hour, until a toothpick inserted in the center comes out clean. Cool 10 minutes in the pan then turn the cake out onto a wire rack to cool completely.
Use a sifter or dustng wand to add a light dusting of confectioners sugar then serve.