All the above are great points on Tokyo. Especially it being a cash city.
Another point I will second is get one of the rail/transit cards for each person on arrival. We used the PASMO card and it worked on pretty much everything in Tokyo except high speed trains. Then we returned it at HND for a full refund of what was left on the cards.
Google map’s transit directions (and having the above cards) were a godsend and made using public transport to get around effortless. We also used uber a couple of times too without any issues.
If you’ve never been to a Japanese bbq place be sure to try that out too! The one we went to was called Gyu-Kaku. There are several around Tokyo. We have them in the US too but might as well try the original while in Japan.