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 five-pointed, star-shaped edifice that doubles as a museum and gift shop. It showcases 12 exhibits on the history of Acapulco, as well as clothing, articles and trade goods from Pacific trade routes. Other exhibits include a look at piracy, the chapel and navigation. Outside the fort, you can enjoy excellent views of Acapulco Bay and the surrounding city.

While some recent travelers said the view is well worth the price of admission, others recommended that you skip the entry altogether. According to reviewers, the museum's exhibits include explanations in English. Others were delighted to find the fort is located within easy walking distance of the cruise dock.

The Fort of San Diego is open to the public Tuesday through Sunday from about 9 a.m. to 6 p.m. Admission costs 65 pesos (roughly $3) per person, and entry is free on Sundays. You can access the fort from Old Acapulco at the corner of calles Hornitos and Morelos. For more information, visit the museum's website (in Spanish).