What you can book
A private day tour from Tokyo covers the storehouse district on foot and by boat, including an art museum in a converted kura. In neighbouring Oyama, ten minutes away by train, a fifth-generation brewer leads a sake brewery tour and tasting. A private strawberry-picking day from Tokyo is listed under the same Tochigi location.
All are new or lightly reviewed. For the boat ride itself there is nothing to pre-book: buy a ticket at the pier.
