I've got one of those red flags on a glass pole mounted on the stern of my Hobie. Every little bit helps. We like to paddle on a full moon in the summer. Have to have headlamps and I have reflective tape on my paddle blades. Something moving like the paddle blades is more noticable than something sitting still. A lot of paddles are white or yellow for visability. The best site I have found for kayak fishing is http://www.kayakfishingstuff.com/
Great folks, good products, and they will talk to you.
See you on the trail, Grunt