First of all, I want to say that I agree that ALT usage in the classroom should be improved and ALTs become more involved in planning and facilitating lesson, as well as more involved in school life in general. I believe that ALTs can take on more responsibility at their schools if the consistently show interest in doing so. However, it's not something that happens over night, you have to build trust with your schools and take baby steps.
That being said, try to look at why they might not be enthusiastic about a specific idea.
Staticnz wrote:Therefore I decided to mix things up and I'm designing a super detailed and exciting lesson, where first the students get to listen to my self written songs, then eat food from New Zealand (my country), then learn about the country through photos, a big map I have with lots of information in English and Japanese, and conversation. Finally I will ask them to teach me about their favorite things, like music, films, anime, manga, in a book I have for the purpose of their teaching me something about Japan.
If I were a teacher, I would probably have the following concerns:
-If this takes up an entire class period, will my students fall behind schedule?
-If this takes place after school, what about their club activities? (Depending on your school, it might be possible to do it as a special event, but that would probably take a formal proposal written in Japanese that would have to be approved by the teachers and administrators.)
-What are the specific language-related goals of this lesson?
-What time of day would this take place? Would eating extra food prevent them from eating school lunch? If it is too late in the day, would it make them sick to eat and then practice sports without enough time to digest? What is the nutritional content of the foods? Would parents approve? What about allergies?
My point is that if teachers are being negative about something, it probably means they have concerns about it. If they are willing to discuss their concerns with you, then maybe you can work something out together. Another suggestion is to start out small- maybe just do some songs for part of a lesson, see how it goes, and build from there.