Bicycle Roller Coaster!

[fiamme red]

http://www.anvari.org/cols/Human_Powered_Roller_Coaster_in_Japan.html

[fiamme red]

http://www.anvari.org/cols/Only_in_China/China_y.html

[Blue Jays]

Bicycle-powered rollercoaster: How fast does that thing go downhill, I wonder?
Hanging by a rope over rapids: There has GOT to be an easier way to cross that raging river someplace!

[rdparadise]

Challenging! :no: