If you feel your brain giving way to the Acapulco sun, refresh your historical knowledge at the city's famous Fort of San Diego (El Fuerte de San Diego). Considered one of the most important Spanish strongholds during colonial rule, the Fort of San Diego is a star-shaped edifice that doubles as a museum and gift shop. It showcases exhibits on the history of Acapulco, as well as clothing, articles and trade good from Pacific trade routes. Outside the fort, you can grab excellent views of Acapulco Bay and the surrounding city.

While some say the view is well worth the price of admission, others recommend that you skip the entry altogether. One reviewer on TripAdvisor says: "I definitely don't think it was worth the admission price. If you're into photography, then it's a good opportunity for some pictures, and a good view of the bay."

The Fort of San Diego is open to the public Tuesday through Sunday from about 9:30 a.m. to 6:30 p.m. Admission is $30 pesos (roughly $2.30 USD) per person, and entry is free on Sundays. You can access the fort from Old Acapulco at the corner of calles Hornitos and Morelos.