At Sai village I recommend you to stay at guesthouse “Miyano” just close to Sai Village office. At this guesthouse you can taste nice seafood dinner and breakfast. Every seafood is so fresh and you are surely satisfied with them.
In Shibetsu town the local gourmet and souvenir is also something to do with Salmon. The recommended local restaurant is “Takeda” located in the center of the town. They offer you various kinds of dishes including salmon. http://salmon-takeda.com If you