If I had access to an unlimited number of nukes, I would go from town to town in Japan, plant one at the center of each city, somewhere in the sewers so nobody would find them, and then blow them all up simultaneously. Then I would start an island-wide fire, burning everything that was not destroyed in the fire. Finally, I would bring ****tons of scorpions to the islands so what we now know as Japanese civilisation never ever happens again.