Sado Island offers so much that it really should have it's own section. Sado is the 5th largest island in Japan (after Honshu, Hokkaido, Kyushu, and Shikoku).
Tourist atractions: Sado Gold Mine, Tub-boats, Earth day festival (Taiko drummers) to name a few.
Sports activities: hiking, scuba diving, swimming, fishing, and more.
Restaurants and fine cuisine
Hotels and camping
Cultural events: Earth day festival and Bon-Odori