Unit 21 in Arizona offers diverse hunting opportunities, but it comes with its share of challenges. Hunters note a significant presence of road hunters, which can be circumvented by venturing into the more secluded wilderness areas, known for holding both Coues and substantial Mule Deer. For those seeking guides, checking the outfitter directory could be beneficial. There's also practical advice about the tough terrain, highlighting the need for a suitable vehicle and possibly a quad for navigating rough roads, as well as the importance of careful tag reading and understanding transfer rules to avoid legal issues.