I'll be there for a wedding and have to get to Tulum. The wedding hotel costs $800/night so my wife and I are staying a ways off from that and we also plan on doing a couple day trips. I speak Spanish fine, and I've driven from coast to coast in Mexico, but it was always with private vehicles or with private security escorts. I'm just seeing so many scams from the rental car agency's online, even the big ones like Avis and hertz.
I travel all over the world, but it always ruins my day when I get scammed or tricked into something because I'm unfamiliar with how things work.