Went to see the caves around the same weekend back in September 2011. Despite being really under the weather, we really enjoyed it and I'd recommend it.
Wanted to to the the ski disguised mountain chalet (which has a big garrison in the rocks below it), but just not well enough to do it. Loved the area, and it was fun speaking French in Switzerland!
I must confess that to sleep and eat we crossed the border into France, just too many bargains to be had with our EUR dominating CHFs