For many of Boston's hotel security directors, the day started like so many other Marathon Mondays, a calm morning full of excitement and anticipation for the events about to begin in the quaint New England town of Hopkinton, 26.2 miles from the Marathon's finish line in Boston's historic Copley Square. Hotel security departments across the city prepared for the event much like they have year after year, reviewing security plans, understanding road closures and generally being ready for the unexpected.