Do’s and don’ts in Tulum?

A few of us are traveling to Tulum and dumb stuff can happen in group travel. So I want to be cautious and prepared.

Seen a bunch of posts here with the following basic advice, which I guess apply to Quintana Roo in general. I have some questions related to them too:

  1. Don’t get/do drugs I get it. But is this because the drugs can be mixed with something OR is it because getting them itself is dangerous

  2. Don’t drive after drinking - makes total sense

  3. Don’t pay in dollars, use pesos.

  4. Do have your wits about you and don’t be alone in secluded spots late night

Any others?