Every year at Easter time, Gordie Nash runs a race out of SF Bay, under the Golden Gate Bridge and back. This video has Gordie explaining the history and ethos of the race, which is similar to marathons - anybody can enter, some row to win, some row to prove they can get round the course, but most row to have fun.
Key facts: 62 boats ranging from 15ft Whitehalls to 25ft double sculls entered. Ages ranged from under 20 to over 80.
Thanks to the IROW forum for the heads up.