Sure, it's a UNESCO onsen, and a bit charming, but taking a dip here isn't the same when it's 33 Celsius outside. We had the Tsuboyu for half an hour - the first 15 minutes we had to use to cool the pool down with adding cold water. After the bath, you're steaming hot and sweating, and you can't cool down in the river here because it's only a shallow stream through town.
In the small hamlet there's really nothing to do, other than waiting for the next bus to Hongu or Shingu. If you're visiting in the colder months, the onsen is probably much more worthwhile, but in summer, opt for a river dip or one of the onsens that have outdoor pools instead.
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