Tainai Kogen Brewery
It's in a very beautiful location.
This is my second choice as far as beer gardens go. Tainai Kogen Brewery
offers a pretty good selection of beer. Don't
bother with the cheese plater though. Order
something better.
There is a large hotel located near there with a wonderful view of the river.
It's in the country not too far from Nakajou. I don't know of any other way of getting there other than by car.

Manma Taco (another came after that)
A good selection of fresh teas
The View from Honsen Oohashi (Summer view)
Enmeji Temple (2)