Coming from Shanghai by G train to Hangzhou. From the train station, how do i get to the West Lake?

First of all, you will arrive at the East Railway Station.
From there, you can take subway line 1 to get to Longxiangqiao Station first. The ticket fare is CNY 4 per person. Then walk west around 550 yards (500 meters) to see the lake.
In addition, after touring around the lake, you can start from Yanggongdi, and walk northeast around one mile (1.5 km) to find Leifeng Pagoda.