Some parts of Acapulco are not considered safe. Similarly the state of Guerrero where Acapulco is located is not among the safe states of Mexico. Below is the travel advisor. My suggestion is anyone not familiar with Mexico to avoid renting a car in Acapulco. It is easy to hire a safe taxi for the full day at low prices your hotel could help on this.
https://www.usatoday.com/story/news/worl...023620001/
https://www.usatoday.com/story/news/worl...023620001/