What to do on a day trip from Hong Kong to Guangzhou? How do I get there by train from Mong Kok?

From Mong Kok to GZ: take bus line 118 from Nelson Street Mong Kok/Bank Centre, Nathan Road, and get off at Cross Harbour Tunnel/Cross Harbour Tunnel Toll Plaza. Then walk south to the Hung Hom Railway Station, and take a train to GZ. The train is available from 7:25 to 20:01, and the duration is about 1 hour. The deluxe seat costs HKD 230, and the first-class seat costs HKD 190.

Upon arrival, take subway line 3, and get off at Yantang Station. Next, transfer to subway line 6, and get off at Haizhu Square. You may go shopping and have some local food around the square and the nearby Beijing Road. Also, you may take a crusie along the charming Pearl River. Have fun!