If your personal yacht has yet to come in, don’t fret — you can still leave dry land. There’s no shortage of interesting ways to travel the local waterways, and all promise sweeping views and a river breeze. Pillage down the Potomac in a pirate ship, for example, or pedal across the river in a workout-on-water. Whatever floats your boat, as they say. First things first: a vocabulary lesson. There’s no “hello” in these parts, young passengers are told upon boarding — “ahoy matey” is preferred. And it’s of the utmost importance to be well-versed in bad words such as “scurvy dog,” “old salt” and “scalawag.” The Boomerang Pirate Ship is fire-engine red and black, adorned with Jolly Roger flags. After picking up landlubbers at the Georgetown Waterfront, it heads down the Potomac, with views of the Washington Monument, Lincoln and Jefferson memorials, Pentagon and Hains Point. The ship is two levels, and there’s an observation deck and full bar (most drinks are $4 to $8). During the hour-long kid-centric treasure hunt cruise, the story is that Evil Edgar, a scurvy dog if there ever was one, stole the keys to the treasure chest and fled. As the “Jaws” theme blares, Edgar appears in a ...