Some universities in Arizona are warning their students not to go to Mexico for this year spring break because of the war to drug cartels.
For me that lives in Mexico and reads everyday newspaper can tell you that is completely safe to come to Mexico beaches and resorts.
The only thing I can tell you is to stay on the resorts, or near them and you will be completely safe.
I really recommend Mexico beaches for this spring break, if I have to tell you a city to avoid i will tell tijiana or cd. juarez, but everywere else on the tourist area is safe.