How to go to Macau from Guangzhou or Hongkong? Can I enter Macau and to Guangzhou after backing to Deli with my visa?

I want to go to Xiamen from New Delhi on 24th Jan and come back around 31st Jan.
While coming back I want to stay at Macau for 2 days . How should I travel means Airlines or ferry or via Hongkong or Guangzhou? I have Visa which is valid till 31March ,but I can stay for 30 days and entry is ONLY ONE. In such a case while coming back can I enter Macau and than again to Guangzhou to come back to Deli?