Spend your fourth day visiting the Chongqing Zoo and Eling Park. Start your morning by exploring the zoo, home to a wide variety of animals, including giant pandas, red pandas, and golden monkeys. Learn about the conservation efforts and enjoy watching these adorable creatures in their natural habitats. Afterward, head to Eling Park, a beautiful hilltop park offering panoramic views of the city. Take a leisurely walk, relax in the peaceful surroundings, and enjoy a picnic with a view. Don't forget to try some local snacks from the food stalls in the park.