Sonoma County Bee Keepers Association offers free educational presentations with activities for classes with grade appropriate material. They prepare several hands-on activities including singing, drawing, and manipulating bee-related paraphernalia. Also covered are more advanced topics in genetics and environmental issues for high schools and adults. Please see this document for a general outline of the various topics covered: Topics Covered in School Presentations (PDF).
For more information and to request a free presentation at your school. Visit their website here.