Stroll along the Xiaoqinhuaihe Canal (小秦淮河) that crosses the city's historical center, and the narrow lanes of the (few) surviving blocks of the old city nearby.
Go for some exercise in Songjiacheng Sports and Recreation Park (entry free; some sports facilities may require fees. Open 17:30-21:30). It's on an island east of the Slender West Lake Scenic Area. The park has an interesting past: farmers' fields and a few small villages were converted to a Wetlands Nature Park in 2005, then to Songjiacheng Archaeological Park around 2009, and finally to a sports park in 2015. Boardwalks through the marshes surrounding the island have been inherited from its Wetlands Park incarnation, while the four gate towers, from the Archaeological Park period. The rest of the landscaping apparently comes from the 2015 remodeling. One can enter the park from the Changchun Rd (via its southern or western gates), or from Shouxihu Rd (via the eastern gate). Bicycles are not allowed in the park, except for those rented in the park itself (at the rental station outside of the western gate); those can be used on the 3,200 m long bicycle trail around the park's perimeter.
On a summer day, walk on a boardwalk trail to Baozhang Lake (保障湖) a popular locals' swimming place, about 2 km north of downtown. The trail starts outside of the southern gate of Songjiacheng, and runs east and north outside of the park's borders (within a narrow strip of greenery that's separated from the Songjiacheng park by the lakes' water).
