Fishermen’s Shack Public Spa

203. Fishermen's Shack Public Spa, Kawazu Literally an onsen at a fishermen's shack. You buy a 300 yen pass at the shop, then walk up some stairs and toward the bay to reach the onsen. They stamp the Shizuoka 60+6 Onsen book. No shower, no body wash or shampoo — just a faucet with a hose and a basin tied to it. Found the water composition sign on top of a cabinet. Water in the bath is clear, hot+ temperature. There's some small debris in the bath (like grass and dirt). Great view of the water and the waterfront. If you're in the area, highly recommended. The atmosphere, bath views, and price — all really strong.

Funado-no-Banya. A 300 yen onsen with a sea view. Moderately hot, very chill. As a bonus, there's a hose with cold water — I gave myself some cold water dousing.