Waterworld California is home to the most water park thrills in Northern California! Located less than 30 minutes east of San Francisco in the East Bay city of Concord, the Park features more than 35 world-class water park thrills. From heart-pounding waterslides, the region's largest wave pool, Northern California's longest lazy river and whimsical water adventures for kids of all ages, there's something for the entire family to enjoy and beat the summer heat! Plus, the Park also features private poolside cabanas for rent, as well as private picnic groves for your group's next company picnic, family reunion or birthday party. Open spring through fall.