1. Get away from the grind: Studies show that leisure time can mitigate job-related stress, reduce the risk of depression, and improve self-esteem. No wonder, then, that Denmark, where employers are required to give five to six weeks of paid time off each year, is one of the happiest places on Earth. Contrast that with the United States, where the average American worker receives only about 16 paid vacation days each year—and more than a third of us don't even take them all. The first rule: Never leave vacation days on the table. Even if you don't have the money to splurge on an exotic trip, a "staycation" can provide a much-needed respite. Second: No matter how much time off your company provides, you can increase the pleasure you get from vacation days by dividing them among several shorter trips, as opposed to one big one. That's because the happiness bump we get from a vacation may come from the planning and anticipation, not the trip itself, according to a 2010 study from the Netherlands.
2. Don't miss happy hour: As tempting as it is to skip out at 5 o'clock on the dot, it pays to stick around to socialize with your coworkers. Why? The happiest people spend about seven hours a day socializing with family and friends, according to the Gallup-Healthways Happiness Stress Index, a massive nationwide daily survey of Americans. At work, that can mean going out for lunch or a cocktail, chatting around the watercooler, or even trading e-mails about a movie you saw last weekend.
3. Shorten your commute: Commuting is people's least favorite daily activity (even housecleaning ranked higher), according to a Princeton study. In fact, a study from the Scandinavian Journal of Economics found that workers who commute 22 minutes each way would need to earn an additional 35 percent of their monthly wage to be as satisfied with their life as those who don't commute. The best deal of all: Walk or bike to work. The negative stats about commuting apply largely to car-based commutes, plus you'll get your blood pumping and be more alert when you start your day.