The Daio Wasabi Farm is the largest wasabi farm in the world and is 45k from Hakuba. It is free to walk around the farm and there are several vendors selling authentic wasabi and wasabi products such as ice cream and Kit Kats.
The Daio Wasabi Farm can be reached by train from Hakuba Station in 1 hour and 45 minutes.
The cost of this trip is ¥1460. The farm is open every day throughout the year.