Add the açaí, pineapple, coconut water, and ginger to a blender, and blend on low speed until large chunks are broken up. Then, blend on high speed until everything is smooth. (The ginger may take a little longer to blend than most smoothie ingredients).
Pour the smoothie into a glass and serve immediately.
Notes & Hints
You may notice this recipe doesn't use a sweetener; I don't think it needs it because the pineapple is quite sweet, but feel free to use maple syrup if you would like to!