The Bar/Lounge at Hotel Flamingos Acapulco
The bar/lounge at Hotel Los Flamingos is mentioned by expert reviewers. Of the 6 publications that we monitored, 2 referenced the bar/lounge, including Lonely Planet and Oyster.
Hotel Flamingos Acapulco 
 Lonely Planet
 Oyster
 "Perched on a cliff 135m above the ocean, this classic boasts one of the finest sunset views in town, with hammocks to enjoy them from, and a popular bar and restaurant" 
 "Features include a freshwater pool, a small pool bar, free parking, and free Wi-Fi"