Dedicate the fourth day to hiking in Mount Qingcheng. Choose from the different hiking trails available, ranging from easy walks to more challenging routes. Explore the lush forests, cascading waterfalls, and ancient Taoist temples along the way. Don't miss the opportunity to visit the famous Tianshi Cave, a Taoist sanctuary carved into the mountain. Enjoy the breathtaking views from the summit and take in the serenity of the surroundings.