Palos Forest Preserve Loop is a standout hiking destination in Orland Park, IL, covering 10.0 miles with 300ft of elevation change. Stats: 10.0 miles, 300ft gain, Moderate. Type: Loop. Surface: Dirt. Time: 5 hours. Fee: Free. Dogs: Yes, on leash. Permit: No. Wildlife: deer, foxes, herons. Best seasons: Largest forest preserve in Cook County. Pack water, layers, and appropriate footwear. Conditions vary across IL. Leave No Trace: stay on trail, pack out all waste, respect wildlife.