|Tokyo (src ^).|
This is a short summary of places to run in and around Tokyo ^. Of course, there are a lot more options, but these are the runs I have tried out. So if you ask yourself "where to run in Tokyo", here are a few suggestions.
If you are located down town Tokyo you can try out the Imperial Palace run, where each round is 5 km, on asphalt. More information here.
If you want company of a group, you should contact Tokyo's International Running Club, Namban Rengo ^. They have track sessions every Wednesday down town Tokyo. More information here. As well they have a lot of other social trips on the weekends, like this one here.
Sayamako and Tamako
For a longer, scenic run (unfortunately mainly on asphalt), you can run around the Sayama and Tama lakes. More information here.
There are many parks in Tokyo, but not all are good for running. One park that is nice though is the Higashimurayama-Chuo Park. More information here.
Sayama Prefectural Natural Park
Another park that is very nice for running is the Sayama Prefectural Natural Park. This is my favourite, as it has got many opportunities, due to it's size and location. Here you can do 420 meter intervals on grass ^, 220m hill intervals on grass ^, hill loops (up and down) ^, stair jumping ^ and much more. There are a lot of trails in this park, so you can make your own signature track that no one might never have done before. More information here.
And some runs I have not tried out (yet) are the trails at one of Tokyo's many surrounding mountains. Several are easily accessible, using trains. For more information on trail running check out this page from Namban Rengo ^. EveryTrail ^ can be another source of ideas.
For a complete list of my posts on running in Japan (mainly Tokyo), check out this link.