When I was a kid in the '70s, my now-sainted Mom would take me to the Fort Worth Zoo, usually on a Sunday afternoon. I can vividly recall that the both of us would use the terms "the zoo" and "Forest Park" interchangeably to refer to the same place.
I have lots of cherished memories from that time. Within the zoo itself, the small children's petting zoo area was still around, with their neat water fountain at the entrance that resembled a lion with its mouth wide open. The old bird house was there, too, as was the original aquarium and the herpetarium ("snake house") at the far end of the property. At the aquarium, there was a very friendly African-American woman who used to sit outside at the entrance. I don't recall if she was an employee, but I seem to remember that she was "old", say, in her 60s. There were also several wooden refreshment stands along the paved asphalt trail that resembled an upturned wedge. They were painted pink with white trim, and they sold snacks such as popcorn, sodas, sno-cones, and cotton candy.
Of course, my favorite area was the Midway, with the rides. I wasn't the "adventurous" sort back then, so I pretty much stuck with the carousel, Ferris wheel, and bumper cars. We always ended the day with a ride on their classic miniature train, which in the '70s was the rolling stock that resembled a 19th Century steam locomotive with open passenger cars. Hearing the train's wheels rolling over the rails was a very relaxing experience. It was an innocent and fun time.