What is the best way from Hong Kong (Ibis-North Point on HK Island) to Guangzhou Baiyun Airport?

You can take bus no.102 from Metropole Building, King's Road to Cross Harbour Tunnel Toll Plaza.
It takes around 25 mins with the ticket fare of 9.3 HKD per person. Then walk northeast to get to Hung Hom Railway Station. Take the train to Guangzhou East Railway Station. After arriving, take subway line 3 to get to the destination.