Is there a simple sightseeing tour from the airport around Guangzhou?

You can take a shuttle bus from the airport to downtown area first. The following three attractions are highlights of the city, you can choose one of them to visit depending on your time:
Yuexiu Park
Dr. Sun Yatsen's Memorial Hall
Temple of Family Chen

Hello, I have about 18 hours in Guangzhou if You Know a good itinerary to kill time and meet, subway stations, bus and already agora which as underground stations to visit that you recommended.
Thank you.

You can go to visit Ancestral Temple of Chen Family and its nearby Temple of the Six Banyan Trees. If time permits, go and have a look of the Pearl River, which is especially beautiful at night.

The airport and the Chen Family Temple is connected by subway, only if you need to transfer two times. The Temple of the Six Banyan Trees is one subway stop away from the Chen temple.

From Temple of the Six Banyan Trees, you can take bus tourism line 1 to the Pearl River. After, you can take subway back to the airport.