For everyone who has children--read them a bedtime story or sing them a song.
Don't get pissed at the guy who just cut you off on the highway, just think--maybe his day has been as stressful as yours.
Tip the waitress a little extra--it's a tough job, and maybe you'll make up for some of the cheapos who don't tip at all. Also, tip the street musicians--they deserve it.
Strike up a friendly conversation with a teenager or any young person--we like that, you know. Share your wisdom with the younger generation--too few of us have the connection we need with our elders. Even if it's that kid all in black with pink hair, they'll probably be grateful.
Hug a tree--literally. It sounds silly, but do it--you might feel a little more in touch with nature. Show the earth you love her.