How do I get from shantou airport to a hotel? I have not booked a hotel yet as I only have 1 night

Do you mean a hotel in ST city?
As I know, the airport shuttle bus has four stations in this city, General Central Bus Station, Mingzhu Square, Civil Aviation Mansion and Taoyuan.

If you will leave the city in the next day by bus, you can stay near the Central Bus Station. If not, you are suggested to stay near the Civil Aviation Mansion. There are several hotels near the Civil Aviation Mansion such as the Green Tree Inn and Home Inn.