Hey there...
I emailed someone from bfm.admin.ch and he told me that principally one should leave Switzerland once the L Permit expires. The reason he gave me is that since the purpose of stay already fulfilled, I should leave Switzerland, although as tourist I don't need a visa to visit Switzerland. He, however, advises me to consult to the cantonal immigration once more....
Maybe I should just cross the border and exit Switzerland and then reenter as a tourist...It sounds a bit silly, but maybe it's then acceptable, as the rule is "can enter without a visa and stay up to 3 months", but not "stay without a visa for 3 months"...Any opinion on the Swiss logic?...
I am thinking whether the thing would become more complicated if I have to go to Germany after my L Permit expires (usually I have german Aufenthaltstitel, but it expires during my stay in Switzerland - I don't need to renew it as I no longer stay in Germany, do I?). I might need to back to my universiyt in Germany to settle the final things about my study after my stay in Switzerland. The same no-visa rule is for me as tourist to Germany...