I arrive Baiyun airport on 27th April and have 6 hours transit time.

To be honest, your transit duration is limited, so it is best to stay in the airport. Roam around and go shopping at the duty-free stroes. If you really wanna experience something during the layover, hire a round-trip taxi for the White Cloud Mountain for sightseeing, on which you can also have a bird's eye view of the city. 1-2 hours are enough there and then go back to catch your onward flight! To achieve this plan, you need to hurry up and seize every minute. By the way, the taxi resevation hotline is 86-020-96900 for your convenience.