I am connected to an elementary school teacher who incorporated nature walks into her weekly schedule. I supported her with ideas to enrich her nature walks.
I also co founded a program called Creatures of Habitat https://www.youtube.com/watch?v=ycwc_4Ly8xg
This program was studied by Royal Roads students and they found that the "hands on learning" component was the best and most valuable part. The program runs now in its 9th year at one day during Earth week in the School District 63 on Vancouver Island
I am not a teacher but I run a forest school program and I am well connected. I could connect you to the teacher I am working with at the Elementary school or some teachers who are at the middle schools.
The education I am doing right now is "forest school practitioner" provided by http://childnature.ca/forest-school-canada/ You will find great information there.
Overall to say... this is all Canadian info and you might be more interested in US contacts. There.. I would highly recommend to get in touch with http://www.butterflyhillnaturepreschool.org
Kristen the head of the preschool will start a community school.http://evergreencommunityschool.weebly.com
Might be a great project to observe their path.
Hope this helped
This is my Forest explorer program for 3 -5 year olds I run through the Recreation centre from our Capital Regional District.
.. a little glimpse
Open house slide show
Forest classes slide show