Embark on a walking tour to discover the charm of the French Concession on day four. Start at the iconic tree-lined avenue, Huaihai Road, known for its high-end shopping and trendy boutiques. Explore the picturesque streets, lined with colonial-era villas and art deco buildings. Visit the former residences of famous historical figures, such as Sun Yat-sen and Zhou Enlai. Take a break at one of the many charming cafes or tea houses along the way. In the evening, experience the vibrant nightlife of the French Concession by visiting one of the trendy bars or jazz clubs.