I want to know where are the most preferable spots to visit Shantou this summer?

Nan Ao Island is the best place to see in Shantou. Besides, Lotus Peak, Queshi Scenic Spot, Symbolic Tower of the Tropic of Cancer and Chen Cihong's Former Residence are some good places worth seeing.
From that city, you can go to Guangzhou and Shenzhen by bus easily. It is recommended to both of the two cities to have a look.