Preheat the oven: Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan or line it with parchment paper.
Mix the wet ingredients: In a large mixing bowl, combine the mashed bananas, crushed pineapple, eggs, melted butter, granulated sugar, brown sugar, and vanilla extract. Stir until well combined.
Add the dry ingredients: In a separate bowl, whisk together the flour, baking soda, salt, and cinnamon. Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Be careful not to overmix.
Fold in the mix-ins: Gently fold in the shredded coconut and chopped macadamia nuts (if using), ensuring they are evenly distributed throughout the batter.
Bake the bread: Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake in the preheated oven for 60-70 minutes, or until a toothpick inserted into the center comes out clean.
Cool and serve: Allow the bread to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. Slice and enjoy!
