The very first sentence of the german.stackexchange-tour after the welcome-heading is this:
(emphasis added by me)
German Language and Usage is a bilingual question and answer site for speakers of German [...]
But the whole tour is in English. Isn't it a bit strange, that the tour of a bilingual site is completely monolingual, and that on a tour for a site for speakers of German you can't find any German word? Even the example-questions and -answers are in English!
I see the need of a tour in English. But there are thousands of people who want to discuss about German language, who are weak in English, because English is a foreign language to them, or who even don't speak English at all. Those people need a tour in an other language then English, and since 100% of all visitors of german.stackexchange are interested in German Language, I think this other language should be German.
Therefore I suggest, that there should be two tours. One in English and the other completely in German, with prominently links on each tour to the other one.