天然温泉水を使用しています
屋外の露天風呂
屋内の浴場
ドライサウナ
Also independently named in a 2020 Google review ("サウナも有り").
日帰りや宿泊客が予約できる貸切風呂
Corroborated by a separate 貸切風呂 amenity tag on the nifty onsen listing.
男女共用の混浴
No source mentions 混浴; the bath is offered as reservable/private use (貸切), which precludes mixed bathing with strangers.
宿泊者以外も使える食事処
Meals are served in the guest's own room, not at a public dining hall/restaurant.
駐車場あり