Pedal-powered hydrofoil and bicycle speed records.

One relatively unexplored direction in human-powered boats is the hydrofoil, in which the hull rides atop aircraft-style wings beneath the water.  Above a certain speed, the entire hull is lifted above the water, reducing drag to almost nothing, and permitting very high speed.  Foilkayak created the Flyak around this idea.
[youtube=http://www.youtube.com/watch?v=U95UReP4mdo&hl=en&fs=1]

Greenland kayaks, the massive productivity gains of specialized tools, and a proposed new design direction.

Kayaking across the Tasman Sea, or dying in the process.

Controllable risks. How to survive motorcycling. How not to survive parachuting.

Two underemployed gents calling themselves Expedition 360 pedaled their kayak-like homebuilt boat across the Atlantic and Pacific Oceans in the mid-1990s.  Here are photos of their crossing from Monterey, California to Hilo, Hawaii.  Yes, they pedaled across the Pacific Ocean.
Interesting combination of wind and solar generators for onboard power.

Self-taught minimalism through bicycle touring.

Go on a personal odyssey, and amaze and impress your friends without taking any real risk:  bicycle solo across Europe, North America or other large land mass.
This is easier than it looks.  Unlike a marathon, kayak crossing or other iconic physical achievement, a person of healthy weight and minimal physical conditioning need not train or [...]

Sea kayaking is usually a dry sport — surprising, considering that you sit about 15cm below the waterline, elbows about 15cm above.
Not so with serious open-water crossings.  For example, Duane Strosaker has kayaked to nearly every island off southern California.  His adventures include remote San Clemente Island, more than 50 miles offshore.  SCI is a naval [...]

It has long bugged me that there are few information sources for what I call “green sports.”  By this I mean not just environmental friendliness, but physical activity with the following qualities:

Powered by human or renewable energy.
Aesthetics, exploration and adventure — not “winning.”
Controllable risks.
Minimalism, punctuated by cool specialized gadgetry.

Examples of such weirdsporten include sea kayaking, [...]