An few blocks away from Akihabara is the Kanda Shrine and Edo Culture Complex. Beautiful design and like many of these sacred grounds, additional things to see and do.
Kanda Shrine is a Shinto shrine and has enshrined these kami: Daikokuten, Ebisu (part of the 7 gods) and Taira No Masakado (a samurai who fought Heian government).
The Edo Culture Center had some cool items for sale (which is everywhere in Japan). But understanding some of the Edo Period’s history is always cool.