Is there any reason for the rebel’s to bother with the red tokens on canyon run? It seems like you can just go around them. Or do you treat them as if their squares have a red outline (which keeps you from stepping diagonally between the token and the corner of the wall)?

▪ Imperial mission tokens represent barricades and traps and are impassable terrain. Tusken Raiders treat Imperial mission tokens as normal terrain.

A figure (without Mobile or Massive) cannot enter or move through impassable terrain. That also applies to corners where impassable terrain and door, wall, or blocking or impassable terrain meet.

So, other than Tusken Raiders cannot go "around" them.

(Edit: tokens don't have terrain type, only spaces have terrain type.)