If I have Zhuhai 72h visa am I allowed to travel to Ocean Spring Resort (1 hour drive from Zhuhai)

Hansi, Zhuhai hasn't carried out the 72h free transit policy yet, so I get confused by your question. You can only use this in Guangzhou, but during the layover, you can travel to Zhuhai and the Ocean Spring Resort. Then you need to return to Guangzhou to catch the connecting flight.

I was asking about the 72 hours visa you can apparently get at the port in Zhuhai ( similar to the one in Shenzhen for a 5 day visit in Shenzhen Economic Zone )