For Earth Day (but really just because the weather is great today), in addition to riding to work, I took an extended lunch break and rode a 25 mile loop along some rural roads near the office.

My daughter's teacher also had a Bizzaro Earth Day. She bikes to school nearly every day, but today she had to drive. I think if you're a regular bike commuter, you can pretty honestly say that you don't need a special day once a year to love the earth.