I Go to Nikko Water-Wheel Park

 A collection of water-wheels was displayed with explanation of each one's origin, the purpose of use and the year of built.
In addition to them, a flower garden and an old Japanese house were well maintained for visitors.
The name of the park is Suginamiki or ceder tree road park. No admission fee is needed.
The park is not well-known, though It is sure worth visiting.