First off, how long have you been studying Japanese?
LikaLaruku said:
Ooh, do some of the stuff my teacher did.
1)Make assignments where students have to translate a sertain number of pages from a raw (untranslated manga) I've learned oodles of Kanji that way.
This might be a bit tough for an introductory course where, among the students, ten kanji might be known, and there's no way they are going to know how to look up kanji by stroke, bushu, or yomi. Working through kids books might be a better bet, because everything is in kana.
2)Give out Japanese snacks & drinks like Lamune, Calpico, Calpico softchews, yan-yan, hello panda, sheets of roasted nori, & let them watch subtitled or raw anime. This is a good way to lure people into the class.
Good idea; also, maybe try and set up a pot-luck day where people bring traditional Japanese foods, along with simple written explinations as to their origins, preparation, etc. Outlaw sushi from this one -- it should be a food that a Japanese person eats at least once a week.
3)Do the "wich language is it?" game...
I can't see this helping too much with Japanese.
Since you're dealng with older students, you could try a written and/or spoken 'telephone' game, where each person has to repeat what all the previous people said, and then add to it.
Try and talk the teacher into kana-only writing assignments -- they aren't going to learn jack if they're writing in Romaji.
Make sure the students speak Japanese as much as possible! If you have the time, sit down and do one-on-ones and/or small groups for conversation, especially with the struggling students. Of course, it isn't going to be easy at first with a very limited vocabulary, but the surest way to not learn a foreign language is to never use it -- all of the failing students from my first few Japanese classes were the ones who spoke in English, took notes in English, and just used the language at a bare minimum.
Incorporate 'fun words' -- things like 'boushi' and 'shibou' ('hat' and 'fat', respectively), that just sound naturally similar.