According to worldatlas.com, Tokyo is the 15th largest city (pop. 8.3 million)
and the most populous metroplitan area (pop. 32.4 million) in the world.
Information on our hotel in Tokyo and possible things to do is here.
Rainbow Bridge with Tokyo Tower in background
You want electronics? Head to Akihabara:
Immersive digital art by team Lab: Odaiba
Sensoji shrine in old town (Asakusa)
Links and resources: