All, Please be warned that even though your credit card may cover damage to your rental car, that is all it would cover. Insurance purchased through the rental agency is the only way to get liability coverage in many parts of the world!
When Katey and Ron rented their car at the Cancun airport, they had the impression that their gold credit card would provide the Collision Damage Waiver part of the rental-- as is common in North America-- and so they declined to purchase this vehicle coverage to save money. (Collision Damage Waiver eliminates the driver's responsibility for damage to a rental vehicle.)
Not good! Later they learned that during three weeks of driving they had not had this protection at all.
Basically, visitors are well-advised to over-insure rather than risk any possibility of under-insurance. Accidents do happen in this area, and even in the case of a minor dent your hassles can mount alarmingly without insurance coverage by a Mexican company. You may even be required to pay damages on the spot.
Don't be penny-wise and pound foolish!
Also with your Cancun car rental avoid driving in heavy rains.
Avoid driving after dark.
Look out for people walking with farm animals.
Make sure that your rental car has good windshield wipers and
make sure your rental car is properly insured!
Watch out for the "topes" (toe-pays): the annoying speed bumps on town roads!
Pedestrians have right of way on pedestrian crossings. You must come to a stop before the cross-walk NOT on it.