Was there last year for my B-day. Drove there from LA.
I would stay on beach or boardwalk.
I speak the language fluenty, have family there, don't walk around like an idiot tourist, and it was still dangerous to get off the beaten path. I did it, but it was risky and it doesn't sound like you know Mexico so stay around the beach. Also, you can also avoid the absolutely nuts drivers around there. They'll do their best not to hit you since the law is really harsh down there, but if you survive the hit, you'll probably go to jail for causing a distraction and causing an accident. I am dead serious, pun intended.