Being a teacher myself, I know that none of us have the summer off. We spend the summers planning for the next year. If you have been toying with bringing more sustainability into your classroom, check out these helpful tips http://www.treehugger.com/htgg/how-to-go-green-school-teachers.html. I might also suggest thinking about a service learning project as well. That will bring in the social justice/equity pillar of sustainability. Don’t forget that sustainability is the intersection of social equity/justice, ecological stability/green, and economic vitality. Happy planning!