Trip suggestion to cities nearby Tokyo, Japan

Hello, Everyone,

I'm traveling to Tokyo in mid-Nov for 5 days (Wed to Sun) and this is my 5th time visiting this great city. I have to be in Tokyo on Sat & Sun for a wedding; so I have some free time from Wed to Fri. Any suggestion on what I can do during those 3 days? I've been to Hakone several times and really enjoyed my visits. Thanks for your help in advance :)

Cheers,
Shirwin