You're right, lad.
The canoe is low and does not make much of a blur upon the lake, but if we are sitting upright in it we can be much more easily seen.

Now, quick's the word!" They took off all their outer clothing and moccasins, putting the garments and their weapons into the little craft, and, sinking into the water behind it, pushed out from the overhanging boughs.

It was a wise precaution.

When they reached the long open stretch of water, Robert felt that the glow from the nearest bonfire was directly upon them, although he knew that his fancy made the light much stronger than it really was.
The canoe still merged with the color of the waves which were now running freely, and, as the three swam with powerful strokes sending it swiftly ahead of them, Robert was hopeful that they would reach the next island, unseen.
The distance seemed to lengthen and grow interminable, and their pace, although rapid, was to Robert like that of a snail.

Yet the longest journey must come to an end.