I haven’t done this extension but have utilized Kensington for a multi week tour of the country. They are fantastic, especially in Japan. They will greet you at the airport, transfer you to hotel, guide you on private tours, take you to the train door for transfer to the next city. If there is a train change someone will meet your train and escort you to the next train. Luggage is shipped ahead to your next hotel and in the next city all the service is repeated. All this, including hotels, trains for probably less than SS. They will take you directly to the ship at the end. All this is a private tour and you can decide exactly what you want included. Highly recommend them. Their guides are excellent.