At Gora Kadan — quite possibly the most luxurious ryokan (a traditional Japanese inn) in the country — the former retreat of the Imperial family has been turned into a spa-lovers dream. Managed by high-end hotel and restaurant organisation, Relais & Chateaux, here, natural hot springs (onsen) are channelled into some of the most spectacular private bathrooms. Mineral-infused waters feed oversized granite tubs or cedar baths (both of which can be pre-filled via an attentive room attendant) sitting on picturesque terraces amid traditional Japanese gardens of cherry and camellia trees. gorakadan.com