[ghaff]

Canoes don't typically have air bags unless they're outfitted for serious whitewater but they certainly shouldn't literally sink even if they fill up with water.

I have trouble imagining the sort of canoeing I'd expect to see as part of a company outing being some life-threatening activity.

(That said, I'd probably avoid this sort of thing if I were organizing a company event. People have different ranges/types of activities they like and feel comfortable with and I wouldn't want to put pressure on people for what's ultimately supposed to be a fun event. I know whenever we've discussed doing anything along these lines as part of an offsite whatever ideas we come up with always get some percentive of strong "hell nos." Doesn't see worth the trouble.)

[ghaff]

I actually got thinking about Grumman aluminum canoes which are obviously denser than the equivalent volume of water. Apparently they do have some flotation built in.