Welcome Flanders!
Enjoy the forum, Zurich and Switzerland.
Check out the EF social activities scene some more as soon as you can. It's pretty diverse and there's always something going on.
I laughed out loud at your wanting to "feel comfortable drinking a beer on the S-bahn". Compared to the number of times I've seen people digesting their 3-course take-away meals on the S-bahn as if they were in a restaurant or cafe, you should get comfy pretty quickly swigging away at your beer!
Still can't get my head around this whole adult "kick-bike" (scooter) thing. The last time I was on one I must've been around 8 or 9 years old. Hehe!
Once again, welcome.