When planning for a "sunset dinner" (with or without reservations) ... or simply looking to catch "la puesta del sol" ... I've always referred to the following website's "sunset tables". Might be helpful for travelers & locals alike.
Here's a direct link to the "Acapulco Sunsets" page ... which can be adjusted for whenever you plan to be in ACA. (Copy & Paste)
Or - use this "shortened url"