We went to Chichin Itza too... also wrecked our rented car after we were hit while at a stop sign. The guy just aimed right for me and hit us....
Policia were on scene in less than 30 seconds, as were the Federal Police. I had to surrender my passport and go to the magistrate to pay for the damages that my (stopped) little toyota corolla or whatever it was caused to the guys rustbucket pick-up, and the subsequent street clean-up they would need to do. Uhhhhhh
I was lucky that I always get the "insure everything" option when renting overseas....