You could take the airport shuttle bus Line 5 and get off at Jinhan Exhibition Center. Then, please walk to the subway station at Yuexiu Park, take the subway Line 2 and transfer to Line 1 at Gongyuanqian stop. Finally, get off at Huangsha stop and out of the Exit D, you could walk to Shamian.

If you take a taxi from Jinhan Exhibiton Center to Shamian directly, the fare is about 20RMB