Water transportation keeps travelers safely above water while crossing a harbor, preventing businessmen from showing up to lunch sopping wet. Dazzle at the next power lunch with today's Groupon: for $13, you get an all-day pass from Cityside Harbor Shuttle (a $25 value).

Cityside Harbor Shuttle's floating vessels zip people to and fro across Boston Harbor, depositing old hands and picking up fresh crews at six convenient locations. The skyline slips by as passengers enjoy smooth sailing guided by the steady hand and seasoned sight-spotting of the ship’s skilled captain. The fleet allows landlubbers to shave minutes off a cross-harbor journey on the Precious Time or adventure aboard the pirate-themed White Pearl. Day passes allow holders to hop on and off whenever a shuttle is docked—ideal for getting around the city during evening outings—or to stand astride sea and shore while declaring mastery over the elements. The vessels constantly rotate among the docks, ensuring swift pickup from any location.