Depending on where you guys decide to meet in SF, I might be able to make the drive out.
Also, unless you know how to read chinese, the keyboard hell store is not very easy to find.
It's located in the "Akihibara" like neighborhood of hong kong.
The address is
Sham Shui Po
Fuk Wa Street 161-175
福仁商場 (no english translation of this)
1/F, store 43
You can see the google map here
https://www.google.com/maps/place/%E7%A6%8F%E4%BB%81%E5%95%86%E5%A0%B4/@22.331788,114.161876,19z/data=!4m2!3m1!1s0x340400b4a7dcdf1b:0x8c37877efa380223When I was in Hong Kong last christmas I bought two G80-3000 w/ clears from him HKD $699 each.
He opens late (officially 3pm) but that day he ended up opening at 3:45pm
Luckily there are a lot of electronics store to stroll near by.
If you look at the google map, you can take MTR exit Sham Shui Po, there is a "Golden Centre" right next to it.
The lower floor sells peripherals (Lots of USB cables, I made the mistakes of picking up 4 colorful ones and then later realized it's not mini-USB, but micro-USB, bummer).
The upper level sells games, consoles etc.
There is another entrance to another section that sell PCs, graphics cards, hard drives, etc.
Also, there are tons of delicious, cheap street food near by. Just see what the locals get and try some of them.
As for milk tea, you're in luck, there is one "tea restaurant" across the street that have got michelin star for it's milk tea/ coffee.
And it's super cheap if you can get a combo meal to go with it.
Have fun!