If the weather forecast is grim, why not spend your day at Yamamoto Isoroku Memorial Hall? You'll be surprised just how many interesting facts you can discover about the past here.
You'll find this collection of historical artifacts in Nagaoka. Once you've seen everything you can at Yamamoto Isoroku Memorial Hall, head to nearby Machinaka Fireworks Museum, Echigo Hillside Park, and Yukyuzan Park.