From ZTL hotel at shenzhen may i know what is the best method to go Fairy Lake?

From your hotel, you can easily walk to reach Laojie Subway Station, where you can take the Luobao Line to reach Laojie Station. Then you can change to Shekou Line to reach Xinxiu Station. Then you can take a taxi to reach that lake.
If you travel with a group of people, it is suggested to hire a local car to reach the lake directly.