Build a recumbent bike that is enclosed and make the shell waterproof and shaped properly to allow it to work as a hull, like a canoe. You'd start with a three-wheel bike, to get the steering wheels outside the waterproof area-something like this, but probably no windshield (I want out if it's sinking)

http://nexus404.com/Blog/2006/11/17/velocipede-hpv/

You'll need to power the drive wheel either with the chain going down from above the water level or with a shaft, (which can be sealed watertight) like this:

http://www.dynamicbicycles.com/

I think the back wheel has one-way vanes connected on a ring that can deploy them together using a float to serve as a paddle-wheel. The float is so they only drag while you are in the water.

Tandem or even three-seat would be even better. I bet people would pay to rent these at a beach or lake and you wouldn't even need a dock.

I see patents for bike/boat, but nothing like this. Has this been done?

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