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Although it is now a part of Kumano, it still kind of feels like its own town. It's a charming place - about 40 minutes from Kumano proper, there are no train lines at all, and when it was independent it had fewer than 2,000 residents. It also used to be known for its mining industry which you can learn about at the mining information center/museum off route 311 in the center of town. Not far from there you can find Seiryuso and Yunokuchi, two awesome onsens quite close to each other. In fact, they are connected by a tiny mining rail car line with only two stops! The shaky little train is a great attraction. As for the actual onsens, Seiryuso is part of a hotel and Yunokuchi has natural water pumped in from deep under the mountains.
獅子岩
Kumano's famous lion rock formation. There is a cafe on one side which is in the perfect spot for viewing.
花の窟
An ancient Shinto shrine.
鬼ヶ城
The demon castle is a stunning rock cave formation against a backdrop of ocean and mountains which you can walk right through.
丸山千枚田
Senmaida means "One thousand terraced rice fields", built into a hill where no machines can reach. It must be planted by hand every year and many of the town's residents show up to pitch in. For travelers, the view of the rice terraces is highly photogenic. It is listed as one of the top 100 rice terraces in the country, a list which focus on scenic beauty.
瀞峡
Doro Kyo is a natural gorge that you can hire a boat ride through.