"Sometimes I think that the one thing I love most about being an adult is the right to buy candy whenever and wherever I want."
― Ryan Gosling
The Candy Stand was a reward from the 2013 Halloween campaign. Like all non-standard shops, it has a high revenue capacity of 250 Zoo Dollars (ZD). Because it was a reward, rather than a purchasable item, it was only possible to receive one candy stand per zoo.
Presumably the candy stand satisfies visitor needs of hunger or thirst, but this is not made clear in the game.
It is no longer possible to acquire the candy stand, though it may make another appearance in future campaigns.
Candy Stand