Preheat oven to 375 degrees F. Grease and lightly flour your loaf pan; set aside.
Cream sugar, margarine (or, butter), eggs, pineapple, and banana until well combined.
Add flour, shredded coconut, baking soda and salt and mix just until combined. Avoid over mixing.
Pour batter into your prepared loaf pan.
Sprinkle the top of the bread with additional shredded coconut, if desired.
Bake at 375 degrees F for 20 minutes. Turn the heat down to 350 and continue baking for 35 minutes - or until a toothpick inserted in center comes out clean.
Remove the bread from the oven; allow to rest for 10-15 minutes prior to removing from the pan.
Slice and enjoy warm with butter.