Theodore Roosevelt National Park South Unit Loop is a standout hiking destination in Medora, North Dakota, covering 9.0 miles with 600ft of elevation change. Stats: 9.0 miles, 600ft gain, Moderate. Type: Loop. Surface: Dirt. Time: 4-5 hours. Fee: $30 NPS fee. Dogs: Yes. Permit: No. Wildlife: bison, wild horses, prairie dogs, pronghorn. Best seasons: Badlands trail through iconic buttes and petrified forest. Pack water, layers, and appropriate footwear. Conditions vary across North Dakota. Leave No Trace: stay on trail, pack out all waste, respect wildlife.