- Don't travel outside the tourist area's light yourself - If you are not familiar with the area, stick with the established tours, which are reasonably priced. If you are staying in the Cancun Hotel Zone, book your tour right from the hotel; although outside the hotels, you can find better deals for the same tours! So for example, there are great tours to Xel-Ha and Chichen Itza if you are interested. We did not have problems when we traveled to Cancun and rented a car, and that was two years ago. I think the situation now requires a bit more caution because of the general situation in Mexico.
- For females, stay in the Hotel Zone especially at nights, and go around in a crowd. We all hear stories about drugs that can be slipped into drinks, females getting ride from unlicensed cabs and getting into trouble, etc. So don't do it. Don't drink too much either, and stay with your friends. Even better, stick to the Hotel Zone and you should be fine, as the standards are pretty high there. Also remember the legal drinking age in Cancun: 18.
- Be careful with their drinking water: Well, that is a cliche, isn't it. But it is good to be safe and stick to bottled water whenever possible. If you are in a place that does not feel safe, then stick to bottled drinks, e.g. beer from bottle (or can). I have found the Hotel Zone to be generally safe for drinks; I would be more worried in the city, or in outlaying areas. It is better to be safe than sorry.
Cancun safety should be on your mind when traveling to the paradise. It is no different from traveling to any other place, you have to know what you are doing. Be safe when you travel to Cancun.
For a safe trip to Cancun, please checkout the Cancun Safety blog post for additional tips on being safe, written by a Cancun enthusiast. I read about Cancun for a whole month before going there the first time. So make sure to read additional Cancun travel tips by visiting http://www.CancunTravelog.com which is the authority source on tips and ideas for having a great and safe Cancun trip.