Zoo Review
I'll begin first with my own experience and then address some concerns of other reviews.
I really enjoyed all of the natural looking exhibits and all of the interactive parts of the zoo such as the butterfly house and lory landing, those birds had such personalities! Also the new tiger exhibit looks great! Definitely try to come early though, as many have stated it gets crowded pretty quick! Especially to see some of the more exciting exhibits I'd hit those first and then meander around to the others. I didn't see much trash though near the picnic area there was a trash can that was overflowing. Overall it was a pretty fun trip!
Now to address concerns:
Parking- As I stated before, get there early the parking lot isn't as large as it probably should be but given the fact that the zoo is located within a park I don't see them tearing up city owned land to increase it. However local parking lot rates seem pretty fair ranging from $5-$10 for the day from what I saw.
Children- In regards to barriers that make it hard for children to see, isn't it better that you lift your child up then see them slip between bars and into the moat? On top of aesthetics I'm sure they built those barriers so no small children could somehow slip in. Imagine the reviews if they weren't there.
Birds, Birds, Birds- As mentioned by another reviewer, the San Antonio Zoo has one of the largest bird collections in the nation, that's what it is known for. Given our hot climate, it's perfect for many exotic bird species and is something to be proud of. Though, I understand if you're a little underwhelmed looking at a extremely rare bird species that just sits on a perch staring back at you.
Polar Bears etc.- Seriously. Polar Bears? In this heat? Of course the zoo is just going to have heat loving species such as African and South American species. I know the zoo had a polar bear years ago but from different accounts that bear looked absolutely miserable in our 90+ degree weather. Having any cold loving animal here would be just shy of torture I think and once again, imagine the reviews if your children had to see those miserable penguins/polar bears on a visit.
Rude people- They're everywhere. I have no advice for your fellow visitors and on my visit didn't have a problem with the ticket holder. Then again I didn't have children with me just two (relatively mature) adults. But I hear a smile can go a long way?
Ramps- I noticed there were plenty of signs warning of drop offs with steps etc. for strollers so I'm not quite sure what the confusion about this came from. Also from what I saw there were nearby ramps near almost all stairs and the ones that didn't have them, had previous warnings showing you to a different route. The only downside of this was in a particular exhibit (can't remember which) where you get to walk around, the ramp portion had you skipping an area. However all those species were represented throughout so it wasn't like you really missed anything. Just something to note.
I hope this helps at least a little bit, just my opinion but I hope some of you are a little more prepared because of it.
Have fun!