The zoo has a gift shop and a stadium. This is unusual for a zoo to have a stadium in the center. That is there so spectators can get a good view of the oyster.
In the episode "The Smoking Peanut," this is the Oyster Stadium where SpongeBob and Patrick go to to see Clamu perform.
In the episode "The Thing," when SpongeBob and Patrick befriended a cement-covered Squidward, not knowing it was actually Squidward, Patrick called the S.W.A.T. team, who took cement-covered Squidward to the zoo. Citizens who visit the zoo then mock him. SpongeBob and Patrick are able to escape through the zoo's sewage system.
In the episode "Not Normal," SpongeBob and Patrick slide through water and into the zoo.