We were skeptical with renting a car in Cancun. Sixt had good rates–they were not as low as Fox, but they were reasonable and high enough where it was not "too good to be true." We had insurance through our AllState policy and AMEX credit card. We declined all insurance. They didn't push any insurance on us but they did place a 42,000 peso ($2,000+ USD) hold for damages. From what I've heard, this is normal for Mexico. National does this, and we received the entirety of our deposit back at the end. SIXT put us in a Volkswagen Vento. It was nice and $19 USD a day. The car was not spotless when we returned it. I cleaned it out a tiny bit but they were ok with the dirt and light sand. Note that you have to call for the shuttle or communicate via Whatsapp (as a courtesy they'll reach out to you the day before).The SIXT airport shuttle was prompt picking us up from CUN T3 (15 mins after we got our bags), however it took 30 minutes for us to be dropped off for our flight home. Leave additional time for the shuttle. Take lots of photos of your rental car – interior and exterior, before and after. Pay for gas in pesos when @the PEMEX stations. Our SIXT clerk/rental associate gave us a great tip for counting out the cash when paying the clerk at the pump, "I am handing you 200, 400, 600, 800, etc.." We will rent from SIXT again, thank you!