Truly unique and only kind of Traditional Japanese village, listed in UNESCO World Heritage. A great things to do is walk around the village and get understanding the uniqueness and special bout the village.
There are some souvenirs shops and restaurant around the village can let you experience the local food. Recommended to visit onsen (hot spring) after your walk in the village so you can have a very relaxing visit to Shirakawa-go.
You can do Shirakawago in one day. Go and see the museum. Very little food options, especially in the evenings.
Book a hotel/inn that offers evening meals. If staying in Shirakawago for more than one day go and see Ainokura (check times of busses at the very friendly and helpful tourist information centre which also acts as the bus station ticket office).