Need Tips/Adivce

Hi! I have been to Japan before (Tokyo, Osaka, Kyoto). I am planning on going back in July and August. I really want to do two weeks somewhere I haven't been yet, but won't break the wallet (I will be balling on a very low budget). I really love nature: hiking, swimming. Especially during the summer heat, I'd really like to go somewhere with access to water. But an pretty open, my main constraint is that where-ever I go I'll be heading to Tokyo next. I am between Okutama, Toyama, Fukishima. Or possibly Niijuma Island or Shikinejima? I think I really just want a different experience this time round and would love to meet others on my travels to hang out with. I have ahdh so its hard for me to make decisions, and Japan having so many wonderful options doesn't help. So I would love tips or recs about where to go to experience a chill vibe in nature but also to interact with others

by ZookeepergameFar3772