We took the train to Oberdorf and the chairlift up to Weissenstein. Then it was a tramp through the snow (along the Jurahohenweg) to Röti:

where we had an absolutely fabulous panorama view of the Jura:

There's a joke that God created the Jura so that we'd have a good place to view the Alps. I guess that's also proof of the fallibility of the divine, because while there's a beautiful view, it's to the South, so pictures are pretty much impossible. :-)
After tramping back to Weissenstein, we rented a sled and sledded back down to Oberdorf:

To remember for the future: the two-day tour along the Jurahohenweg from Balsthal -> Weissenstein -> Grenchen is going to be a must do on some non-winter weekend when the Föhn is blowing.