I work IT in a hospital and go to school full time. It's a non-profit origination that currently has six hospitals in the region. I work at their main hospital which was constructed two years ago and cost $500,000,000 to build. Most of my job involves me running around and fixing hardware and software issues. The biggest motivator is making the medical staff and patients happy. It doesn't matter how crappy the day or situation is because it all trickles down to patient care. Seeing a smile on patients face is all it takes to make my day. It's a good job, but I don't love it because my interest fall under something more creative such as videogames/video production.
I got into the job by starting at a position with minimal qualifications, medical records. There are plenty of positions in nutrition services, environmental services where you can get your start as well.
I don't know if I would count it as a job, but I also do mission work on the side for areas in need such as Haiti(Earthquake), Ethiopia, Oklahoma(Tornadoes) Getting involved basically requires 1.Getting involved with an organization(Red Cross, local church, Samaritans Purse, 2.Raising money to pay for the trip(You'd be surprised how generous people are) 3.Getting vaccinations and medication for the destination you are visiting.