Donate blood
http://www.americasblood.org/go.cfm
And bone marrow.
http://www.marrow.org/
Read and exercise every day.
http://www.sciencedaily.com/releases/2006/12/061219122200.htm
Don't be a jerk.
Cigarettes are absurd.
I have a personal theory that Batman is not an actual superhero, but he's pretty great anyway.
I enjoy dragging people to museums and parks with me and going to movies by myself.