1. Want to be happy?

It's more about perspective than anything else. Write down three good things that happen to you every day.

Every night for the next week, set aside 10 minutes before you go to sleep. Write down three things that went well today and why they went well. You may use a journal or your computer to write about the events, but it is important that you have a physical record of what you wrote. The three things need not be earthshaking in importance ("My husband picked up my favorite ice cream for dessert on the way home from work today"), but they can be important ("My sister just gave birth to a healthy baby boy"). [Flourish: A Visionary New Understanding of Happiness and Well-being]

Next to each positive event, answer the question "Why did this happen?"

More here: Things that are proven to make you happier.