Rent a bicycle and embark on a cycling adventure around Slender West Lake on day four. Explore the scenic trails and pathways that surround the lake, taking in the fresh air and beautiful landscapes. Make a stop at the He Garden, a classical Chinese garden known for its intricate design and tranquil atmosphere. Enjoy a picnic lunch amidst the peaceful surroundings. In the afternoon, visit the Yangzhou Slender West Lake Ecological Park, where you can observe various species of birds and wildlife. Take a leisurely walk along the nature trails and soak in the serene ambiance.