Red Hills State Park Highest Point is a standout hiking destination in Sumner, IL, covering 5.0 miles with 300ft of elevation change. Stats: 5.0 miles, 300ft gain, Moderate. Type: Loop. Surface: Dirt. Time: 2.5 hours. Fee: Free. Dogs: Yes, on leash. Permit: No. Wildlife: deer, turkeys, foxes. Best seasons: Highest point in southern Illinois. Pack water, layers, and appropriate footwear. Conditions vary across IL. Leave No Trace: stay on trail, pack out all waste, respect wildlife.