Tokyo has many, many parks and nice they are too.
I was there for a couple of days in November on the way to NZ and met up with a colleague (Japanese speaker) who gave us a wee tour. Emperor’s Palace gardens, a very open park where tons of locals were playing sports, picnicing, etc. and another (densely-wooded) park with a huge shrine. Can’t remember names, sorry. Lots of interesting shrines and small gardens to check out.
I found Tokyo to be much less mad than I expected (after seeing movies and TV show), and the folk were friendly, even if you did just point at things on menus and indicate the quantity! Some simple phrases (please, thanks, hello) go a long way. Subway was easy to use (altho there apparently still some stations with no English signage) and 99% of road signs had English+Japanese on them.
I’m keen to go back…and see more of the country.