We plan to have a trip from Hangzhou to Huangzhan and then back to Shanghai. I know we can buy bus tickets to Huangshan at Hangzhou West Bus Station. But I am not sure whether the bus will stop at Tangkou or Tungxi. I prefer to stop at Tangkou as it is close to scenic area. Can we pre-buy the return ticket (from Tangkou to Shanghai) also at the Hangzhou West Bus Station?