Preheat the oven to 350°F (175°C).

In a mixing bowl, mash the ripe bananas with a fork until smooth.

In another bowl, mix the flour, baking soda, and salt together.

Add the sugar, coconut milk, eggs, diced pineapple, and shredded coconut to the mashed bananas, and mix well.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Fold in the chopped nuts (if using).

Pour the batter into a greased loaf pan.

Bake for 70 minutes or until a toothpick inserted into the center comes out clean.

Let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.