If you'd love to add a bit of extra culture to your vacation, put Fudenosato Kobo on your must-do list. See if there are any guided tours or just roam around at your own speed.
You're spoiled for sightseeing choice in Kumano. Fudenosato Kobo is a great place to start here, but there are many other fine sights to experience. Mazda Museum, Saka Bayside Beach, and Mazda Museum are not far from the museum and will round out your day nicely.