Travel advise for first time visitors

Hello everyone, I’m travelling with my wife to Cancun for the first time during Christmas for 4 nights. We booked Royalton Riveria. Just few questions if anyone can advise: 1. Any experience about Royalton Riveria? 2. Any suggestions for travelling nearby? 3. Is it better option to rent a car? Saw many people posting about cops scamming and stuff! 4. If not, what’s the best budget friendly hotel to airport and back transportation options you may suggest? 5. Any other tips for newbie’s?

Thanks in advance.