You’re in charge of attracting peeps by creating the best park possible. In order to attract peeps and encourage them to spend money on food and souvenirs, you must invest the coins they pay to visit the park into new and improved attractions.
The stars that you earn from completing tasks and upgrading cards act as experience points. Every time you reach a new level, additional attractions are unlocked for your park, but you must open decks of cards before you can build these new attractions.