Originally Posted by RFNJ

They don't have those in Acapulco. However, all the major hotels in Acapulco have taxi-stands. These are not simply places where any taxi can line up. Every taxi "belongs" to that site. I know that the standards for the Princess drivers are very high - they need to have newer vehicles, in good condition. They are safe, and responsible.
For travel from the airport to the resort (I don't know if the Princess has a shuttle), you can use the taxis at the airport - they too are dedicated airport taxis, and supervised. It is a 10 minute trip from the Airport to the resort.
If you decide to go to the beach, getting a taxi home is simple. All the hotels along the bay have similar taxi-stands, with 4 door blue and white taxis. You can grab any one of those. These sites are everywhere - Walmart, and the two major malls (Galarias Acapulco and Galarias Diana) also have taxi stands.
It is also fairly common practice that if get a taxi driver you like, to get his number and use him exclusively. Most of these guys will ferry you around, and wait for you while you shop, eat, tour, etc. They all have Whatsapp.

Feel free to haggle (only airport taxis have printed fixed prices), and agree on price before getting in.

This is probably the most conservative (read: safest) way to travel around the city. Many people have no problems flagging down any blue and white taxi on the street - even the old beetles that still run around. It all depends on your level of comfort.