The bullhorn blared as three cardboard kayaks lurched into the Hudson River from Pier 84 in Manhattan. Their occupants paddled across choppy waters toward a bright yellow buoy about 20 meters offshore.
All three boats completed the course, though not without a struggle.
Revived in July after a six-year hiatus, the Cardboard Kayak Race invited New Yorkers back to the waterways surrounding the nation’s most densely populated city…