Cowabunga Bay the water park in Henderson has a deal right now just for recent graduates, a special admission fee of $20.15. To get the discounted rate you just have to show a senior id pass for high school or college. The special pricing runs from today to June 7th and the park is now open daily. The park is located at 900 Galleria Drive in Henderson and the phone number for more information is (702) 850-9000.