You can take Subway Line 2 from Yuexiu Park Station to Guangzhou Railway Station Exit F, there you can take long distance bus from Guangdong Provincial Bus Station to Zhuhai Gongbei Bus Station, after arriving, pass the customs to Macau. Kids costs half the price. Takes around 2 hours to reach the destination. Remember to take the bus that arrive at Gongbei Bus Station (拱北汽车站), you can immediately get to the customs after getting off the bus.