handicrafts and geocaching here
What language(s) do you learn? I wouldn't call it a hobby, I just do it because there's a need but it's actually quite good fun that way. Vi kan snakke litt norsk hvis du liker det!?
How funny, du kannst natürlich auch gerne auf Deutsch schreiben ;-)
And I'm learning Norwegian too - perhaps not exactly a language you need as a tourist, given that there are only a bit over 5 million people speaking it and most of them also speak English really well, but I live here now, so that makes it kind of important.
I like making things nobody really needs - cards, wood stuff, vases from broken lab glassware, amigurumis and other crochet/knitting, funny geocache containers... If you have thought about trying geocaching then you should simply give it a go! Start with something easy, and somewhere quiet because it will take you a while to find even quite easy ones in the beginning and you start feeling suspicious pretty quickly when there are people walking past all the time. It's great fun and a hobby that probably attracts a higher percentage of people with Aspie traits than there are in the general population. Until I tried it I thought I don't like any trainspotting sort of thing - well, changed my mind about that. I find it a great way of exploring interesting areas I would not find otherwise and to have a purpose when going out on my own (which I would otherwise do a lot less).