One of America’s largest water parks, this 70-acre park, which sits approximately 10 miles north of Denver, features 50 attractions, including a circus-inspired lazy river and the Thunder Bay Wave Pool. Children may also have the opportunity to meet the park’s walrus mascot when they’re not zipping down slides or playing in the pirate-themed water playground. Plus, families have access to free parking, complimentary admission for kids shorter than 40 inches, and reduced rates for seniors.