Today is Memorial Day.
Memorial Day began following the Civil War as Decoration Day. After World War I, the annual spring day of remembrance became known as Memorial Day and grew to honor not only Civil War soldiers, but Americans who have served in all wars and branches of the military. Memorial Day was declared a national holiday by Congress in 1971.
As a national or federal holiday, many folks (but not everybody!) have the day off. Many spend the day celebrating with family and friends in what has become the unofficial start of summer--something we Cape Codders can attest to just by looking at our roadways!
As with all federal holidays, municipal services are unavailable/closed including town, state and federal offices, the US Post Office too. Kids have the day off and most stores (with the exception of package stores) and attractions are open.
If you are planning on visiting a Cape Cod attraction/museum, call ahead, schedules vary. The Cape Cod National Seashore and all its beaches (watch out for sharks!) are open as are town beaches, many of which don't require a parking fee or sticker yet.