Thanks for the reaction. There's an interesting blog that follows the Yuru Camp trail, showing some photos of the real sites that inspired the anime.
For example, https://tomsblog.data.blog/2020/04/17/yuru-camp-backpacking-part-2/7/ shows some photos of the onsen visited in this episode, comparing the actual photos to the anime scenes.
More stuff in the two part blog at:-
https://tomsblog.data.blog/2020/04/11/backpacking-around-the-mountains-for-yuru-camp-part-1/
and
https://tomsblog.data.blog/2020/04/17/yuru-camp-backpacking-part-2/