From BPL 2013 staff picks,
"this year I fatbiked wilderness trails almost unrideable on conventional bikes"
(1) Bicycles are not allowed in designated wilderness areas where I live, neither national forests nor national parks.
(2) If this was in a non-wilderness location, his riding some of that "fresh and interesting" terrain sounds as if he was intentionally going off trail. In Flagstaff, Arizona, a college town, the mountain bike park in the edge of the forest is heavily impacted from riders taking "fresh and interesting" routes.

