It's no coincidence that the word "muse" is in "museum!" Namahage Museum aims to inspire and educate its visitors, so add it to your schedule.
You'll have sightseeing choices galore when visiting Oga. Namahage Museum is an ideal place to start here, but there are plenty of other fine spots to check out. Oga Onsen, Oga Aquarium GAO, and Shinzan Shrine are near the museum and will round out your day nicely.