ピノッQパーク

Located right next to Nakabae Green Park, this area offers a place to take breaks, use the restroom, and more. It's only open on Saturdays and Sundays.
They also offer a full-on Mini 4WD course too.
The park is closed on weekdays, but tours are available at the "Omarugawa Pumped Storage Power Station" for groups of 10 or more (reservations are required).