If you're visiting Shinjuku, nearby there's a narrow street called Omoide Yokocho. Just take in the vibe and choose a yakitori spot to grab a bite and drink your poison of choice (tea/beer/sake). I would recommend going at night/dinner time.

Speaking of Shinjuku and videogames, if you've ever played any yakuza/like a dragon game, you owe it to yourself to go to Kabukicho and its big red gate.

In any case, whatever you choose to visit in Tokyo, it will be really nice, and a lot of it will still be waiting when you eventually come back.

Cheers!