Doc, it's an area I'm very fond of. Haven't been back in a while, but I wrote this article about the place a couple of years ago:
http://www.blackrussian.cc/skiing-1.html
... originally here on our "parent" site ...
http://www.fishandfly.co.uk/tpedit0103.html
When I fish the Dranse again, I'll take some *really* heavy bugs - I don't think double-shotted tungsten would be overstating the case - and try to find the areas where the French haven't already fished everything out and eaten it. It's sad, it's a cliche, but it's true.
Lucky people, your son and daughter-in-law. Whereabouts in Chatel is their chalet... up in the old town where you still see the cows and catch a whiff of the byre as you clank down the icy road from the Super Chatel telecabine? Let me know...
Theo