CB Radios
The requirement of a CB permit was dropped about 10 years ago. Channel 9 is monitored for emergencies, but if you are off the beaten path, you'll only be talking to your traveling amigos.
Spiders, Snakes, and Critters
Baja is home to a wide variety of wild life. Mule deer, big-horn sheep, the rare mountain lion, and the ever-present coyote, along with a multitude of rodents and reptiles, live in dozens of unique ecosystems. Eighteen species of rattlesnakes are indigenous to Baja. Scorpions tend to live in dead cactus and dark, cool areas, and love to crawl under tents, ice chests, and shoes left out. The sandy beaches of the Sea of Cortez are a haven for stingrays. Get tagged by one, and you can expect several days of serious grief. Wearing a pair of dive booties or shuffling your feet along the bottom should do the trick.
Keeping Your Nose Clean
If it is illegal in your hometown, chances are that it's illegal in Mexico. Possession of drugs, public drunkenness, and speeding are the most common offenses. Down south, trials are not speedy, and the minimum sentence for possession of narcotics is 10 years. Think about that before you cross the border. You don't want to spend any time in a Mexican jail.