In Tokyo, there is a landmark that is very useful as a checkpoint – the rainbow bridge, it goes across Tokyo Bay over to Odaiba.
I have already mentioned Odaiba earlier, This is an articifical island very modern dedicated to large corporations like Fuji, amusement parks, museums of technology and beachside.
From my house, you can see in the far end the rainbow bridge. There are many fairs and fireworks displayed from there. What is impressive in Tokyo is that in general fireworks are real long shows lasting for 1h30 up to 2 hours in some cases and with beautiful shapes and great music and sound. This attracts crowds so I prefer to watch from far away