Fun Things To Do By Yourself Outside

HelpGuide.org. https://www.helpguide.org/articles/mental-health/self-care.htm

Mental Health Foundation. https://www.mentalhealth.org.uk/explore-mental-health/publications/how-to-look-after-your-mental-health

Greater Good Science Center (UC Berkeley). https://greatergood.berkeley.edu/topic/happiness/definition