Climb aboard one of these restored (coast-guard approved) former World War II amphibious vehicles for a drive-by tour of the Mall, Smithsonian Museums, and several monuments. The “ducks” splash in to the Potomac River for awesome views of the city from the water and emerge back on land at Reagan National Airport, offering a cool perspective on incoming airplanes (be sure to cover little ears). “Wisequacking” captains entertain passengers with anecdotes, historical facts and jokes (and gives kids yellow duck whistles). Note: no space for stroller storage. Tickets can be ordered in advance online or purchased at the Union Station ticket booth. Adults are $32, children age 4 to 12 are $16, and children 3 and under, free, discounted tickets online. Open mid-March through October.