Hotel Kanyo in Miyagi prefecture near Sendai City and Kesenuma city, which is in the Minami Sanriku coastal area, is a nice place to spend some free time by the ocean. The hotel has hotspring baths outside and inside and the view of the ocean is calm and refreshing. Oysters are grown in the bay near the hotel and the many plots can be seen as lines in the water. The website can be visited in Japanese only but has information on how to get there: http://www.mkanyo.jp/
Below is the room we stayed in.
The train station near Hotel Kanyo with snow on the tracks on new years eve.