Public or private onsen?
Public onsen is much more spacious and cheaper than private onsen,
but the latter allows 100% privacy for yourself or with your loved ones.
Onsen etiquette should still be strictly adhered to even though
you are not seen by the public eye – please preserve its natural best
Public onsen is available for use at almost any time except during
a specific cleaning period – 1-3 hours, varies in different establishments
Private onsen usually requires advanced reservation for an hour of usage (or less/more)
Ryokan with public onsen may not necessarily own private onsen facilities
Ryokan with private onsen may not necessarily allow non-staying guests
(especially foreigners) to book its private onsen