On Rick's home page, under "our tours", they show two people with a German flag standing in front of a "muraled" building. That building is the city hall of Lindau. Lindau is an island city on Bodensee. But, as far as I can determine, none of Rick's tours go there. The only time I think any of his tours go even near Lindau might be on day 9 of his Best of Europe in 14 Days tour, when they go from Füssen to the Berner Oberland, but I really doubt that the bus goes onto the island, but goes past the island on the mainland and around the end of the lake, through Bregenz, Austria, to Switzerland.
Anyway, I can't find any of his German tours that mentions spending any time in Lindau. It's a shame. I've stopped in Lindau for a few hours many times on my way from Bavaria to Switzerland or to Baden Württemburg, and I spent four nights there in 2017. It's a beautiful town, with a lovely view out of the harbor to the snow capped mountains of Switzerland.