Gokoku-ji also oversees the practice of Japanese tea ceremony in all the country's temples. On the day I visited, there were many women visitors in kimono.
The temple was built on the top of a hill and it is said that there was once a nice view of Edo Castle from its grounds. Now the view is of office buildings down Otowa-dori.
This temple is not a famous tourist spot, very few foreigners have even heard of it. I would recommend visiting the temple, then take a walk downhill through Meijirodai and Sekiguchi, until you reach the Four Seasons Hotel and their magnificent garden.
An antique/flea market is held on the grounds of Gokoku-ji on the second saturday of each month, from 7:00 - 16:00
Access: Gokokuji Sta. on the Tokyo Metro Yurakucho Line
5-40-1 Otsuka, Bunkyo-ku
http://www.kotoku-town.com/special/8/gokokuji (Japanese only)