Amphibious Kayaking

Tired of wheeling your kayak down to the launching point and dealing with your kayak wheels? Some kayaks, like my Delta 18.5, have plenty of cargo space to pack away wheels, but not all kayaks do. Wouldn't it be great if you could just leave your wheels on the boat when you hit the water?
Randy Ridings came up with the perfect solution, what he calls a "quayak", a pedal-powered amphibious kayak. Check out the clip below:


Of course, he's not the only person to try something like this. In 2008, engineering students from the University of Southampton build an amphibious bicycle:


Here's another style":


Then there's this thing which appears to be a combination surf board bicycle:


The WaveBike! Combination bicycle and surfski: