Here is the sentence:
We will canoe down the river this summer.
Here canoe is a noun that is like a boat. How can we say "canoe down" in the sentence above?
You are right. Canoe is a noun but then it's also a verb!
Canoe (v) - (sport) travel by canoe.
The word canoe can be either noun or verb.
noun: a light, narrow boat with pointed ends and no keel, propelled with a paddle or paddles..
verb: travel in or paddle a canoe.
It's always a good idea to consult dictionaries.
Also, in English, verbification is common:
Verbification, or verbing, is the creation of a verb from a noun, adjective or other word. Verbification is a type of functional shift. It is also a form of derivation, and may involve any of the various derivational processes.
And yes, in order to answer this question, with the help of Google's search engine, I googled both canoe's definitions, and also verbification. One dictionary also lists googleable as a word too.