Relationships: Invest in close relationships; organize shared experiences; perform acts of kindness.
Health: Sleep, exercise, meditate, and relax. (melatonin, 10% Happier)
Work & Leisure: Plan your day; minimize internet use; pursue challenging leisure activities. (more)
Mindset: Act happy; count your blessings; record your gratitude.
Psychology textbook: Myers and Dewall
Literature review: Diener et. al 1999
Psychological studies: Web of Science, Annual Review of Psychology
General-audience books: Haidt 2006, Lyubomirsky 2007