Get enough exercise and sleep: Sounds trivial, but it's not. You may have the urge to work 24/7, to skip the gym and to stay up late to get a few more things done. That's short-sighted. Exercise and sleep are critical to having the physical and mental energy necessary to meet a challenge.

One of the things that surprised me the most is how often we assume that because something's fun for someone else, it makes somebody else happy, it will make us happy.

Some kind of clutter is difficult - letting go of things with sentimental value, sifting through papers - but some clutter I find very refreshing to clear. I drive my daughters nuts because I'm always wandering into their rooms to clear clutter.

Writing makes me happy.

One reason that challenge brings happiness is that it allows you to expand your self - definition. You become larger. Suddenly you can do yoga or make homemade beer or speak a decent amount of Spanish. Research shows that the more elements make up your identity, the less threatening it is when any one element is threatened.

Happiness comes not from having more, not from having less, but from wanting what you have.

When I find myself focusing overmuch on the anticipated future happiness of arriving at a certain goal, I remind myself to 'Enjoy now'. If I can enjoy the present, I don't need to count on the happiness that is (or isn't) waiting for me in the future".