How can I go to Shenzhen Airport or Crown Plaza Hotel SZ from Guangzhou airport ?

From the airport, you can take the airport shuttle bus line 6 to reach the CITIC Plaza and then walk to reach the GZ East Railway Station.
From the east railway station, you can take the bullet trains to reach Luohu Railway Station in Shenzhen. From railway station, you can find the Luohu Subway Station, where you can take the Luobao Line to reach Shenzhen airport or to the Window of World Station.
If you reach the Window of World Station, you can get out of the station from Exit A and then walk to reach your hotel. If you reach the airport, you can find the airport after you get out of the Airport East Station.