Cube and seed the watermelon.

Peel and chop the cucumber.

In a blender, combine the watermelon, cucumber, Greek yogurt, coconut water (or regular water), and lime juice.

Add honey or maple syrup if you prefer a sweeter smoothie.

Add a handful of ice cubes for a cold and refreshing texture.

Blend on high speed until the mixture is smooth and creamy. This usually takes about 1-2 minutes, depending on your blender's power.