Update 1: Where do you pass by on foot? There is a footbridge connecting Tsuen Wan Town Hall to Tsuen Wan MTR Station. Basically, if you leave the Town Hall on the bridge and go to Tsuen Sun Place, you will see the fork, turn left, and follow the river all the way to the end.
At the end of the overpass is Tsuen Wan MTR Station. Almost most of the roads are located above the overpass. I can’t explain the details along the way. In short, you can go straight after passing the bifurcation point near Tsuen Sun Tin Di. There are two stations in Tsuen Wan and one is near Nina Plaza.
The West Rail Station at Promenade Park is another MTR station near Nan Fung Centre. Map.maps.yahoo/place/?lat=22.37290147879434&lon=114.11278009414673&bb=22.37432517%2C114.11109298%2C22.37147777%2C114.1144 672&addr=%E9
%A6%99%E6%B8%AF%E9%A6%99%E6%B8%AF First, go north along the footbridge of Dahe Road (mountain) and go straight. You don’t need to fall off the overpass. Just go straight to the end and then go to Qingshan Highway.
You will see Discovery Park, where is Tsuen Wan MTR Station. Along the way, you will pass through Sha Tsui Road and Tsuen Sun Place.