Say “no” only when it really matters. Wear a bright red shirt with bright orange shorts? Sure. Put water in the toy tea set? Okay. Sleep with your head at the foot of the bed? Fine. Samuel Johnson said, “All severity that does not tend to increase good, or prevent evil, is idle."
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.
Happiness can seem like an abstract, transcendent notion, but in fact, I found that getting enough sleep (very important!!), getting exercise, not letting myself get too hungry, not letting myself get too cold (I'm a person who is always cold), made a big difference. Partly because I felt happier, partly because feeling physically comfortable makes it easier to keep other difficult happiness-boosting resolutions like biting my tongue.
