Cool thread. Interesting to see what everyone does.
I'm an energy analyst at a mechanical/electrical firm in Boston that does all the electrical and HVAC design for large commercial buildings. Work is project based, so it stays interesting (for the most part) but I push tons of paper, which can get frustrating. Riding a desk does absolutely nothing for me - I wish I could go out and work with my hands sometimes.
Weekends in the winter I coach snowboarding for 10-14 year olds in New Hampshire. Basically day camp. It's awesome, I love working with kids.