Wheeler National Wildlife Refuge Trail is a standout hiking destination in Decatur, Alabama, covering 5.0 miles with 80ft of elevation change. Stats: 5.0 miles, 80ft gain, Easy. Type: Loop. Surface: Gravel. Time: 2-3 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: sandhill cranes, bald eagles, deer, wood ducks. Best seasons: Premier Alabama bird watching in the Tennessee Valley. Pack water, layers, and appropriate footwear. Conditions vary across Alabama. Leave No Trace: stay on trail, pack out all waste, respect wildlife.