You can open your very own Zoo once you reach level 24. To do so, simply restore the Zoo entrance located near the train station.
Develop your Zoo by collecting animal cards, building enclosures, and buying animals. Fill orders from the animals and visitors to earn rewards and unlock reward chests. Don't forget to decorate your Zoo—the more animals you have, the more decorations are available.
You can find animal cards in reward chests in your town, win them in events and regattas, or get them as a reward for filling Zoo orders. For more information, check out the article, How do I get animal cards?