Want an energizing activity to add to your weekend? Pull up your Smartphone Maps and point yourself toward the nearest waterfall for some waterfall hiking. Waterfalls are not only breathtaking, but they are also health generating. Negative ions produced by waterfalls can help increase oxygen flow to the brain, which can combat drowsiness and boost energy. Health experts agree that exposure to negative ions boosts your immune system, digestion, blood pressure, sleep, and emotions in a positive way.