"Pedal Pushers" produce propulsion in the water. I sometimes think that a kayak makes a rather good surface lure for sharks. I think it all depends on the hull color parameters(i.e. funky shine, reflection, fluorescence); the elongated surface plug shape of the hull; the scent trail of fish carelessly stringer towed over the side(or blood/offal scent splattered on the hull) and the sonic rattler effect of pedal pushing gears and non-rythmic, erratic paddling that is so attractive to sharks. Add the time of late afternoon (4:00 P.M.) to early evening and you increase the strike ratio.
Carelessly going far out into deeper water without knowing what is out there also increases risks. Going near rookeries, areas or points where Great Whites hunt in numbers is just too much for my nerves.

Point is.... asking around won't cost you anything. No intel means get ready to collect on your insurance.