We spent a very enjoyable weekend there;)
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I've driven along the lake Onuma many times so far and sometimes noticed a small signage. It's very easy to overlook it. But every time I found the small board, it intrigued me. Finally, I parked the car near it and stepped into the bush.
A five-minute walk took me to a small Shinto Shrine and there was an iron ladder near it.
Climbing down the ladder, you can find a hole from which spring water is flowing out.
It is said that the water never dries up.
You can see the hole when you climb down the ladder. I feared a lot lest I dropped my camera in the water.
It was a sort of an adventure for me and felt that I conquered one of the secrets of the Onuma area.
I love roast beef sandwich of Yamakawa Ranch(or Is "stock farm" a better expression?"). It costs 800 yen but I think it's worth trying. To get to the Yamakawa Ranch, take the prefectural road 43 from 338. If you are driving to Onuma Park from Hakodate, at the nearest intersection from Onuma Station, turn right. There is a Seven-Eleven on the corner.
Its soft served ice cream is delicious and attracts not only tourists but locals. Last weekend, I dropped by the ranch again and tried green tea(Macha)-taste ice cream. It costs 320 yen. I liked it, too.
I recommend trying their products if you have a chance;)