It's generally safe to travel in Cancun alone, as long as you follow a few simple rules. Avoid drinking as much as possible. It's not a good idea to get drunk in general, but especially when you're alone. Stay in well-populated areas, and avoid deserted streets.
10 Things You Definitely Should Not Do in CancúnDon't JUST Stay in the Hotel Zone.Don't Lose Your Resort Bracelet.Don't Only Stay in Cancún.Don't Eat at Señor Frog's.Don't Go at Spring Break.Don't Visit in the Summer.Don't Rent a Car.Don't Skip the Street Food.