>>228781
Jury summons, huh... I've never understood what non law educated people are doing in American court rooms, but that's how it is, I guess. Is it a crime not to participate, or what?
I count on that you're visiting all the "big places" in Tokyo, like Akihabara, Shinjuku, Ikebukuro, Shibuya etc. In Akihabara, don't forget about the back streets. There are tons of small interesting shops apart from the main street. Also check for several floors, the shops are often small, but may have up to 8 floors with different stuff, and the stairs/elevator can sometimes be hard to detect.
In Shinjuku, I recommend The Lock-Up Bar if you go with some friends, it's a pretty tacky but amusing "monster prison" bar where you sit in small cells and drink colorful scary drinks out of test tubes and similar.
Right beside it is the basement bar Mysterious, that also has very nice drinks in a bit more relaxed atmosphere. Both places have non-alcoholic/weak drinks as well.
For karaoke, "Karaokekan" are the most common, but I find that "Pasela Resort" have a better selection, especially of anime songs and similar (a little more expensive though, but no big deal).
Winter Comiket is during the New Year's weekend usually, so I hope you'll stay for that.
There's also Reitaisai in November, if you care about Touhou. http://reitaisai.com/
Also Comitia in November, that is only about self-produced comics and wares (no fanworks): http://www.comitia.co.jp/
All of them in Tokyo Big Sight in Odaiba, that is worth a visit anyway. Now, maybe towering scyscrapers isn't as impressive to an American as to a Swede, but it's Tokyo's most modern area, and quite an impressive sight. There's also the Future Museum (Miraikan) and the life-size Gundam statue out there that are pretty interesting.
Hakone is the place to go for hot springs and spa resort needs, and should be pretty close to Yokohama. Everyone else in Japan will be there too during the autumn, of course. For an indoor spa, there's a pretty nice and not too expensive one in Korakuen in Tokyo, on the top floor of the mall there. There's also an amusement park outside and around the buildings, but I don't know if it's open in the winter. The rollercoaster is worth a ride, though. And of course Korakuen Hall, the big sports arena.
Among all the fashion and music stores in Shibuya is also a pretty cool Mandarake store, located here: https://www.google.se/maps/dir/35.6590161,139.7009872/35.6615399,139.6978052/@35.6604029,139.6993669,18z/data=!4m4!4m3!1m0!1m0!3e3?hl=sv
If you want to see sumo(and you should), there are regular tournaments in the big sumo hall in Ryogoku (close to Asakusa). It's pretty damn cool. Bring food, they only have one stall that gets very busy. http://www.buysumotickets.com/Sumo_Event_Calendar.html
Beside the sumo hall is the Edo-Tokyo Museum, that is also worth a visit if you want to learn about the history of Tokyo. An impressive building, like a giant space ship.
Maybe that's enough for now...