Dave Greene has fallen in love with the art of canoe poling. This technique allows a person in a canoe to travel against the current of the river. With remarkable ease, you can propel your canoe through nearly anything. This sport takes some athleticism as good balance and sense of the water are necessary.
The learning curve is steep but once you have given it a try, you will want to go again and again.
The opposite of Poling up a river is Snubbing down it, also a great amount of fun.