IAAPA industry statistics International Association of Amusement Parks and Attractions water fun at a local lake $219 billion leading thousands of people to visit welcome International Association of Amusement Parks and Attractions International Association of Amusement Parks and Attractions nearly 375 million of us go them every year ropes course industry statistics leading thousands of people to visit IAAPA IAAPA kid’s party place more than 400 amusement parks over 400 to choose from in the U.S. hundreds of millions of guests each year more than 400 amusement parks International Association of Amusement Parks and Attractions average American theme park IAAPA reports one estimate