An alcohol ban goes into effect at Cape Cod National Seashore's Cahoon Beach in Wellfleet from May to September. The ban prohibits alcohol consumption and possession of open alcoholic beverage containers on its property around Cahoon Hollow Beach this summer. The ban takes effect May 20 and continues through Sept. 10. Officials describe the new regulations as a response to an increase in alcohol-related safety issues at Cahoon Hollow over the past few years.