Nanjing Road is one of the world's busiest shopping streets, so dedicate your fourth day to indulging in some retail therapy. This vibrant street is lined with a plethora of department stores, luxury boutiques, international brands, and local shops. Explore the various malls, such as the iconic Shanghai No.1 Department Store and the modern Plaza 66. Don't miss the opportunity to try some delicious street food from the numerous food stalls along the road. Whether you're looking for fashion, electronics, or souvenirs, Nanjing Road has something for everyone.