I have just finished developing a 12-day intensive Japanese language and Hiroshima Culture course with the Hiroshima International Center. I have been busy inviting people from around the world, but because it starts in less than 4 weeks, I was given the ok to invite people living in Japan as well. The course is aimed at people with a Japanese level of 2級 or equivalent so I believe it will be a useful and interesting experience, even for CIRs.
The first course is offered from July 26th to August 4th, so you could even participate and still catch your free JET jet home. The next course is for mid December if you are still hanging out.
I have just translated a ton of info on it, so if you'd like it, please email me at email@example.com
I also hope you can help me pass this on to any ALTs not on the forum who speak Japanese well.
Oh yeah, most importantly, the price is 9万円 for 12 days, including classes, feild trips, room and breakfast, so you wont find a better price anywhere!