When you are done your good deed, treat yourself to a plant cupcake! Super simple... chocolate cupcake in a terracotta pot, green icing and a sprig of mint! Source There are tons of earth day crafts and activities you can do with your kids to help them learn about Earth Day... here are a few of my favorite listings
http://crafts.kaboose.com/holidays/earth-day/earth_day_crafts.html
http://www.dltk-kids.com/crafts/earth.htm
http://edhelper.com/caring_for_earth.htm?gclid=CI2gzMacmqECFQk65Qod7waSOw
