Falling over board
being hit by the sails
drowning
drowning
drowning
drowning
being hit by the sails
drowning as a result of falling overboard
drowning as a result of falling overboard
In 2011 the USCG reported that Alcohol was the leading contributor in recreational boating accidents. It accounted for 16% of the deaths.
I'm pretty sure that the leading cause of deaths is auto wrecks, and shootings.
Pregnancy.