At this waterfront ryokan, you can laze about in the outdoor saltwater bath while watching boats sail by. The rooms are spacious, the shared indoor bathroom has sea views, and the meals feature local seafood and veggies grown by the friendly owners (no English spoken). There is a range of rooms and plans. It's a 10-minute walk from Honura Port.
For something special, go for one of the hanare (separate) cabins (from ¥16,200 per person for two people with meals, with discounts for more people), which have private bathrooms and huge balconies.