We went on the Kawasaki Factory Night bus tour as operated by Hato Bus from Tokyo Station, recommended as it clearly is something off the beaten tourist-track for things to do in Tokyo! But you need to reserve in good time as it is a really popular bus tour. The bus tour only operates from autumn till spring, when it is dark enough in the evenings to enjoy the sights. Fun detail: the bus tour starts with a stop at a yakiniku restaurant which is included in the trip and ends with the tourist guide singing a bit of karaoke while the bus drives back through the night over the motorways around Tokyo. 🙂
The section on the way back over the motorway to Tokyo Station along the petrochemical factories is dreamy!
Treat it as a unique photo-walk and you cannot go wrong, but bring a tripod! See here for details about the tour.