In the long run, party more.

Follow the link for the, seriously, "Chart of Regret".

collision detection: Study: In the long run, we regret virtue more than vice:

"Hedonists, rejoice! A couple of Columbia University researchers have found that in the long run, people tend to regret having missed out on opportunities for pleasure -- and they wish they hadn't been so diligent about working. What's more, our attitudes reverse over time. In the short run, we're proud of our ability to work hard and delay gratification. But years later, we regret that choice.

...Of course, these findings totally violate how we're told about to behave. It also violates how we think about ourselves. When asked to define their values in the abstract, people regularly claim that delaying gratification gives you a better life. Yet when asked to think about specific incidents in our lives -- as these researchers did -- those values crumble, obviously."