You can say
Sierra magazine had a list of the top "Cool Schools" in the U.S. Some of them have their own farms where students can work, others train students to install solar panels -- the list goes on and on. You should check it out.
You should look into Sierra Club Outings' service trips.
They offer a great trip to a beautiful location -- and a little work to keep you busy, such as trail or cabin maintenance. Plus you get to meet a whole crew of fun people.