Earth Day is a great day to get kids involved in learning about the Earth and ways to recycle, reuse and restore. Here are some links with suggestions on what to do with the kids.
Carrots are Orange - 20 activities for kids and families
TeachersPayTeachers - Nature Scavenger Hunt (you will have to register to download it)
3 Boys and a Dog - Kids activities and snacks
TinkerLab - 50 Earth Day activities
Melissa Ash - mom of 2 energetic boys, wife, and business woman. Just trying to "do it all".