The
Flage Code states: "When flags of two or more nations are displayed, they are to be flown from separate staffs of the same height. The flags should be of approximately equal size. International usage forbids the display of the flag of one nation above that of another nation in time of peace."
The United States Flag Code addresses the flying of the US flag either alone or in conjunction with other flags - as noted above. If you aren't flying the US flag, then you are not in conflict with the code. Note that the code does say that you should fly the flag on certain holidays, so one could conclude that you can fly the Canadian flag alone except on Memorial Day, 4th of July, etc., etc., when the US flag should be flown insead - my interpertation only here.
Also note that state law with respect to flag display may come into play - for instance, New Jersey prohibits the display of a flag of a foreign country unless accompanied by a U.S. flag of at least equal dimensions.
So go head and fly your flag and happy camping!