Anywhere you go will be awesome
It's good that you're looking at places other than Tokyo Osaka Nagoya and other big cities though! I was talking to this dude here in Japan the other day, and he told me that the biggest piece of advice he would give to foreigners coming to Japan to live for the first time would be not to live in the big cities.
Hrm. I dunno where I like though. Shikoku is pretty fun. There's like. Nothing there. Kyuusyuu anywhere is nice too. It would be awesome to go to Aomori. I have never been there but I hear the dialect is ridiculous. "zuuzuu ben"