The Pittsburgh Zoo and Aquarium is one of the most underrated attractions in city, in my opinion. The habitats are fantastic, and the overall presentation of various species is both educational and entertaining. The food options are somewhat limited, but I don't go to zoos for gourmet cuisine. The aquarium is also great; it's been recently renovated and is a great improvement on the old building. You can easily spend an entire day at the Pittsburgh Zoo, so take your time. My favorite part is their very impressive children's section of the zoo, which not only encourages interaction with the animals but teaches children what it's like to be the animals. This big kid loved it!