Raging Waters San Jose, Northern California 's Largest Waterpark, offers 23-acres and millions of gallons of family fun and attractions, including the newest ride Dragon's Den. Raging Waters features thrilling high-speed slides, and family attractions like the 350,000-gallon Wave Pool and The Pirate's Cove- an interactive themed water fort. Raging Waters is located off Tully Road on the grounds of beautiful Lake Cunningham Regional Park in San Jose and is easily accessible from major highways.