My mother actually brought me the link to this site.
If your kids are interested in nature and/or the National Park System, go to WebRangers. This is an interactive, learning site on the National Park System website. They complete all these fun, educational activities to earn online badges towards becoming a 'junior' ranger. It is in place of their real life Junior Ranger program for people who do not live close enough to a National Park to participate.
Mary is loving this site! She is choosing this over WebKinz during her computer time!!!! And that is a big deal.