Living in Japan and Learning Japanese during summer? (Highschool student)

I'm planning to live in Japan during the summer for a month or so, mainly to learn the language. I'm turning 16 before the summer and around n3 level, (though I've focused mostly on speaking and listening so my reading level is much lower) I haven't taken the jipt but I can listen to some native content

I looked at summer exchange programs for highschool students but most of them featured a lot of touristy activities that I'm not that interested in,

It feels like a bit of a shame to fly all the way to Japan to sit in a classroom and learn Japanese through a textbook so I'd like to mostly focus on learning through immersion

i've considered trying to find a summer job or volunteer but I'm not sure what kind of job would accept me / be good for improving my Japanese or if this is even plausible at all. my main goal is to improve my Japanese (whether through a school, living with people or through a job) but a bit of freedom to explore around on my own would also be nice!

i'm not quite sure which direction would be good, so if there are any good exchange programs, ideas, etc, please share them!