it of course depends on the size of the canoe! a "normal" canoe (about 15' long) can have 3 seats, its easier with 2 people (and room for the coolbox and beers) but they can also be paddled solo (by...
Most canoes fit three people - two paddlers and a "duffer" in the middle who does not have a seat, and usually does not paddle. If your canoe is on the small side, there may be less room for the...
Most kayaks are built for one person, but there are kayaks made for 2 or even 4 people.
Sit-inside kayaks typically have a cockpit which fits just one person. There are double kayaks with two...