Water Wizz touted as being Cape Cod s Only Waterpark" is a water park located in East Wareham, Massachusetts. THey have many slides and kiddie attractions. NOte though that Wareham isn't part of Cape Cod. IN the summer of 2009, the park was used as a filming location for the movie Grown Ups.WAreham is a town located in Plymouth County, Massachusetts. AS of the 2000 census, the town had a total population of 20,335, with an estimated 2008 population of 21,221.