The folks at Adventure Cycling have come up with their list of favorite rail-trails, & I’d say they’ve compiled a great one. Here are their ten best trails, in no particular order: 1. George S. Mickelson Trail, South Dakota; length: 109 miles. 2. Great Allegheny Passage, Maryland-Pennsylvania; length: 141 miles. 3. Trail of the Coeur d’Alenes, Idaho; length: …