Buy sweets and bread for a Route 320 break
See Yuki-hime, choose Yumekobo bread or baumkuchen and yuzu sorbet, then browse vegetables and processed goods at the fresh-produce market. Even without a restaurant meal, you can take Hiyoshi flavors back to the car.
Parking → Yuki-hime → Yumekobo → fresh-produce market → toilets.
Handmade bread may sell out or still be baking; arrive early if you have a particular item in mind.