Not only should Kielce Historical Museum (Muzeum Historii Kielc) be visited, but also Sushiya. Visitors state that it's fine to go here for the Japanese meal. Good nigiri is the recipe for success of this restaurant. Ordering the delicious ale is a good idea. Sushiya offers great tea among its drinks.
You will certainly like the comfortable atmosphere. The TripAdvisor rating for this place is 4.5.