While I wouldn't call it Forest School (we are in the prairies in TX), I do run an outreach program that brings nature inquiry to preschool classrooms. The visits are set up like an on-site field trip, with a curriculum support for the classroom teachers. The curriculum support gives teachers ways to incorporate the monthly learning theme - the big idea - into their existing curriculum and pre-k centers. The visit takes the class outside to explore the natural wonders found on less-used areas of their campus, both giving the students the outdoor exploration and inquiry as well as modeling an outdoor exploration for the teachers.