Cool down on a hot day with a refreshing watermelon smoothie. In a blender, combine chunks of watermelon, a splash of coconut water, a squeeze of lime juice, and a handful of ice cubes. Blend until smooth and creamy. You can also add a few fresh mint leaves or a sprinkle of chia seeds for extra flavor and nutrition. Pour into a glass and enjoy this hydrating and nutritious smoothie. The natural sweetness of the watermelon makes it a perfect base for a healthy and delicious smoothie.