Summer Camps Barnum Island, NY & Sports Classes Summer sports camps in Barnum Island, Nassau County, NY & year round sports clinics and recreation are provided by the US Sports Institute.Barnum Island summer camps and sports classes are designed for all ability levels and players aged 3-14. For more information or to register for summer camps in the 11558 area please click on the following search which represents our current Barnum Island, NY summer camp & sports class offerings: Summer camps & sports classes close to Barnum Island  |