My suggestion: don't say sister and soon to be wife, I assumed it was one and the same person fkr a moment ๐ญ
The other more important recommendation is any national park that is convenient for you. The different ecosystems and environments of the world is what I find special.
Sand dunes, waterfalls, volcanoes, whatever you want.
If you don't wanna walk too much, go for a picnic or smth. Get local street food or the infamous Japanese 7/11.
https://www.japan.travel/national-parks/ Here's some activities too. Have a good time.
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