IMO Acapulco is so '50s, albeit there are resorts, etc. south of town. But you're getting into the rains season, and IMO the state of Guerrero is best to avoid. Hatfield-McCoy type feuds, narcowars, rampant corruption. Coverups of healt issues, etc.

I have friends and family who go there or even have weekend homes there - they know what precautions to take and yet aren't entirely at ease.

If you like the new, Ixtapa or northern Puerto Vallarta; if you like more staid, Zuhuatanejo or Vallarta or some points south. My opinion, but I'd go elsewhere. (There's a reason for those great prices.)