Visiting a waterfall is a cleansing experience for the mind & the body by the sheer beauty of being there are also through the invigorating ions.  

The waterfall creates negative ions which once they reach the bloodstream, are believed to produce biochemical reactions that increase levels of the mood chemical serotonin, helping to alleviate depression, relieve stress, and boost our daytime energy.

Negative ions are generated by moving water so get out the beach, go on a hike next to a river, or swim under a waterfall.