There's nothing more calming than perching on the banks of a river and watching the water flow downstream. Why not pack a picnic hamper and spend a leisurely few hours at Oi River?
To explore this flowing body of water, make your way to Shizuoka Prefecture. You'll find lots of other worthwhile attractions in this area, such as Shimada City Museum, Fujieda City Library, and Shimada City Baranooka Park.