Shio no Yu is a ryokan that has a popular day use option up in the hills north of Osaka. It is a long train and bus ride to get out to this corner of the prefecture. Some might be surprised that there are rural places like this in the prefecture at all. The baths are ryokan style baths so not much in terms of variety, but you are getting some really high quality water this is a good place. The well is actually a cold one and they heat up that water for the baths.