When I was in graduate school, I was fortunate to have taken a number of interesting science education classes. One of these was a workshop based on Project WET, a non-profit water education program for science educators. The Project WET Curriculum and Activity Guide is geared toward students ages 5 through 18. The nice thing about the book is that there are charts in the back, breaking down the activities by grade levels (K-12), time required, subject areas, topics, and things like group size. Activities range from looking for contaminants in soil, to holding water court, to imagining yourself as water. You can download a sample activity on Project WET’s Kids Page.