I would advise against doing it with 3 in a Canadian, it's too heavy. We came SECOND last (note not actual last) the year we did it with 3, we did, however, swim about thrice though? The following year Skel & RÃÂona came middleish with only 2 which was fairly awesome and they swam along the way so I think 2 is the way forward, or if you're going for 3 don't take the used-to-be-yellow Canadian we 'transformed'.
The party after is always good, and it's cool to say you've done it, so everyone should.