First off let me say I really like the manga, it's well written, well researched and most importantly fun. I would recommend even if you're not into camping
I've personally always considered camping to be synonymous with hiking. It's foreign to me to see someone not leaving the campground and enjoying the attractions as opposed to directly interacting with nature. That said, I find it wonderful to see people enjoying nature differently and in ways to appeal to them. The locations and attractions in Japan all seem extremely beautiful and I would love to visit one day.
Lastly due to COVID people have been swarming my usual hiking trails (which is a good thing (but also bad since I'm there to avoid people lol)). Just make sure to respect the nature and culture of the area when you're there. Clean up after yourself and know the rules of how to interact with others/animals in case you run into them. Try not to be too loud with your conversations and allow for people to overtake.