1. Keep busy and be more active
2. Spend more time socializing
3. Be productive at meaningful work
4. Get better organized and plan things out
5. Stop worrying
6. Lower your expectations and aspirations
7. Develop positive, optimistic thinking
8. Become present oriented
9. Work on a healthy personality
10. Develop an outgoing, social personality
11. Be yourself
12. Eliminate negative feelings and problems
13. Close relationships are the number one source of happiness
14. Put happiness as your most important priority.

Cited from Fordyce, M. W. (1983). A program to increase happiness: Further studies. Journal of Counseling Psychology, 30, 4, 483-498.