Take a cruise down the Geibikei Gorge in South Iwate in a traditional boat pushed by a guide who tells stories and sings songs of the river.
Pick up some fish food for 50 yen to feed the large gold and red fish which follow the boat down the stream. The water is shallow and these glorious fish are highly visible for the entire one hour trip. When you reach the gorge, test your luck by seeing if you can throw a rock from the bank into a small crevice on the rocky cliffside.
The trip is only 1,500 yen in an area well worth a visit.