I hope this isn't received negatively, but I while understand your thinking, think about your first day. I don't know if you were already a seasoned teacher or not but I was not and while I do not hold it against my predecessor for not doing so (mostly because I doubt she ever wrote any to leave me), I would say I would have found it to be a huge help if there had been at least 4 or 5 lesson plans left behind until I got the hang of things. If it hadn't been for a 3 day mentoring session I went to (early on), it would have taken me longer to find Waygook. I really had no idea what to do for the first month and a half. I think it would be good to leave behind a few basic lesson plans that you found successful; such as body parts, greetings, feelings, food, and weather or colors and days of the week. Stuff like that could be a huge help to a newbie and help them to reflect the right image of NETs. At the very least leave them a letter on what the school expects of them (lesson planning, tape recorder-as in being one-, extra afterschool classes, no overtime, etc.) My opinion is a few lesson plans to get them started would be helpful, while still requiring them to do their own planning beyond the few you left.