Work less. Smile more. :)

Seriously, this is one of the best times of your life...unless you take a job that squeezes every bit of energy and life out of you. Achieving work-life balance early in your career will make this profession sustainable for you in the long run; so I'd focus on that.

Beyond that: do whatever jobs interest you at the time, live on less than you make, and don't forget to backup your work.