Hi, how can four adults to make a half day visit to Zhuhai from Guangzhou?

Well, I'm afraid that half a day is too tight to tour around Zhuhai. If insist, you are suggested to take high-speed train to save time. The duration is about an hour. You can visit New Yuanming Palace and downtown area. Then you can go to South Yingbin Road to have some distinctive local foods and go shopping.