If you go to Atami that is in the south west of Tokyo (40 minutes by Shinkansen), you must go to Atami. A small city on the sea with a beach where people take the sun during summer. Also there s a funny sexy museum on the moutain : Atami sex museum.
Many funny objects, some games, videos. Quiet old museum, but you can spend almost 45 minutes there as there are many rooms. Not too miss !!!