The Zoo in San Antonio is worth the drive. I've been there about 5 times and it's fun for me even as an adult. There's so much to see. Our favorites are the Monkeys (of course) and the Hippo's. The last time we went they had a new baby Hippo and she was beautiful! They have animal food machines around the park that you can buy (for about a quarter) and feed SOME of the animals. The gift shop is nice, but expensive. There's a train ride, refreshment stands, restaurants. Alot of the animals don't come out when it's real hot but it's still worth the price!
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