I’ve had guests fly in and immediately rent a car or head out and rent a car the following day. Mostly because they think they need to or because they are trying to save money by doing everything themselves. A few even did so after I warned them against it and then mentioned after that it was not the best idea. Unless you are an avid driver or you really enjoy driving, the days can be extremely long, getting lost is common, and it can be pretty stressful for everyone. I do not even own a car and I recently borrowed a friends to take my family on a day trip. I learned my lesson and I will never do that again!
At the time of writing this a Dodge Attitude from Hertz runs $72 USD per day if you are 30+ with unlimited mileage and full insurance. You are still responsible for gas, driving everywhere, toll fees, entrance fees, guides, and food throughout the day. And when you arrive home you have to fill the car with gas and return it the the rental agency in the same condition. A trip to Tulum Ruins and Coba Pyramid would run you $300+ USD or about $75 USD per person with 4 people, plus eight hours of driving.
As I said above, I would never do this now and for good reason. If you compare the 4 n 1 Tour, which is the most popular in Cancun and costs $79 USD while I write this article. The 4 n 1 Tour actually includes four popular destinations: Playa del Carmen, Tulum Ruins, Coba Pyramid, and a Cenote, Entrance Fees, Tour Guides, Buffet Lunch, Swimming and Round Trip transportation with air conditioning. It seems to be that driving just does not make sense in this situation! You see and experience twice as much, spend about the same or less per person, and ultimately no one has to drive. You have the option of relaxing, chatting with friends or family, sleeping, and even having a few drinks.
Skip trying to rent a car and drive. Instead book a tour, relax, and enjoy your vacation with your family and friends. Save car rentals for excursions outside of the normal.