The Cleveland zoo has been successfully operating for decades now. Their zoo is clean and offers what makes zoo-goers happy: a huge variety of animals (an aquarium for aquatic lovers, a bird section, large cats, primates) and the concession stands and gift shops key to a zoo (what zoo would be complete without cotton candy and hot dogs?). The zoo is well-maintained, and the zookeepers are friendly and willing to point you in the right direction. Trams are available on a regular schedule for transport.
PROS: Clean, many animals
CONS: None
more