Jim,
We found a great way to ski the park and get away from the snow machines
was to stay in the park at Old Faithful Snow Lodge. You can catch a
snow coach in, and then you can ski around to the geyser basins, to
Mystic Falls, Kepler Cascades and Lone Star geyser. You can also catch
a snow coach to the trail head for Fairy Falls (and then ski back to the
lodge along a power line if you want to avoid the road) and you can
catch a snow coach over to the Canyon area if you'd like to ski that
area. You can do the same basic thing by staying in Gardiner or Mammoth
(which has some advantage since you can drive there, but the ski
conditions are generally better in the Old Faithful area), but its a
long way from the north entrance to Old Faithful in a snow coach. It is
also a long way on skis from West Yellowstone to Old Faithful and there
is a lot of traffic, even in the winter, along that road.

James wrote:

Has anyone done any skiing in Yellowstone? Jim