Glen, Guy, and I went for an easy mountain bike ride on the converted railroad grade (rails to trails) from Tetonia to Lamont. Easy riding since it is never more than a 2% grade. The old railroad trestles have been repaired or replaced, with very nice decking and railings. Here is the new bridge across Badger Creek.
The views are better if you ride north-to-south, so you have better views of the Teton Range.
Teton Rail Trail (partial) at EveryTrail