Okay kiddo, let me explain what a nihon minka-en is. Have you ever been to a park with lots of different types of houses and buildings from a long time ago? A nihon minka-en is like a park that has lots of traditional Japanese houses and buildings. These houses and buildings were made a long time ago and show us what life was like in Japan a very long time ago.
People go to nihon minka-en to learn about how people in Japan used to live. They can go inside the houses and see what the rooms look like, what kind of furniture they had, and what they did in each room. They can also see different types of Japanese buildings, like a tea house where people used to drink tea, a storehouse where they kept their things, and even a watermill where they used water to grind grain into flour.
So, a nihon minka-en is a really cool park where you can learn about the history of Japan and what people used to do a long time ago.