I'm putting this here so I can find it again...

Hi Gatsby:  the qotd above reminded me that I was going to post some info on where to run in Tokyo.  Here are a couple of links, let me know if you have any questions.

This is a trail run on the western outskirts of Tokyo:

https://www.mapmyrun.com/routes/view/24391980

This is a route in central Tokyo, I used to stay in the New Otani hotel (s/f of this route) alot. The first and last part of this plot includes a shorter run I did a lot.  It went to the Imperial Palace, then I'd do a loop and then run back (I think it was 5 miles).  Running around the Palace, which I think is about 5k)  is a very popular run.

https://www.mapmyrun.com/routes/view/235510367

Here's one in Kyoto (I couldn't remember if you mentioned if you were going there).

https://www.mapmyrun.com/routes/view/1184624

Also, I don't have a plot, but it's nice to run along the Philosopher's trail but you'd have to do that early in the morning before it gets crowded.

Actually, it's a good idea when in any part of Asia, it's good to get out early before it gets too crowded.