Hi,
I'd be interesting in joining in on one of these cycle tours.
Living in Weil, I often cycle to some of the outlying villages in Germany and back. I know of a decent route that could take in all three countries:
Lange Erlen, through the "green border" into Germany, past Laguna, then towards Alt-Weil, Haltingen, Binzen, Fischingen, Efringen-Kirchen, Märkt, Friedlingen, over the Dreiländerbrücke into France, through Huningue, back into Basel...
Anyway, just a suggestion.
I've never been to the Petite Camargue, so I'd be interested in going there as well.