This area was once the site of a large farm known as La Aurora, which today gives its name to the zoo [1] and the airport. A future phase of the airport's renovation and expansion will supposedly bring about the creation of a city park on the grounds of what was once a horse-racing track. Details on the project are sketchy but it’s expected to include sporting facilities and spacious grounds for strolling.
Zona 13 also houses a number of fairly good museums, all adjacent to each other in a large complex, and the city’s zoo.
Links:
[1] http://www.moon.com/destinations/guatemala/guatemala-city/sights/zona-13/la-aurora-zoo