The National Wildlife Federation has some great information on creating a schoolyard habitat. This is the kind of thing you could plan during post-planning to give time for the summer and to have them ready for the fall. There is also a way to certify your school yard habitat. We have two gardens at our school and outdoor classrooms and the students learn so much. I highly recommend considering this at your school. This can be done with all ages.
Here are some lesson plans for phonics and writing for younger students to use in your classroom. I've sorted it by the most popular first including some Outdoor ideas and some phonics games you could play.