Line 4 of the Suzhou Metro reaches Wujiang. Take the southeast fork of the "Y" shaped Line 4, terminating at Tongli Station. From the tourist desk at Tongli Station, one may buy a ticket to see the town that includes a round-trip shuttle bus and entrance to all the major historical sites within.
Once inside Tongli, the streets are narrow and only suited for walking. However, one may buy a boat ride to see the city from the water.
TongLi official site in English.
Wujiang includes the water towns Tongli and Zhen Ze, very picturesque with many canals, bridges and old buildings. These were formerly market towns for surrounding agricultural areas and are now doing quite well as tourist attractions, mainly for Suzhou people wanting to escape the pressures of the big city.
Zhen Ze is a historical town with a river running through the center. The old buildings are still occupied by residents. 1-hour walk from the East End to the West End of town. Things to see are the Ci Yun Pagoda and temple ¥10, Shi Jian Tang, Yu Ji Bridge (qiao), and Shi Fan Bridge (qiao). The tomb of astronomer Wang Xiao An is located in a museum in Zhen Ze Middle School at the West End of town. Entrance fee is ¥5.