The Yunokawa reference article from the English Wikipedia on 24-Apr-2004
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Yunokawa

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The Yunokawa Onsen (湯の川温泉) is one of Onsen in Japan. It is located in Hakodate near the Hakodate Airport.

It contains mineral, chloride, silfur, etc. Most of the Onsen costs around 500~800YEN. It is the beginning of the Hakodate. Yunokawa is not the middle of the Hakodate, but since Hakodate is not a big city if you want to see everything in Hakodate, you should go to Yunokawa Onsen.