Go high tech.

I'd take a military folding mountain bike with tubless rideflat tires and a removable gasoline engine capable of going > 50 km/hr.

Get the bike from:
http://www.militarybikes.com/para.html

Get your engine from:
http://www.fiveflagsmotorbikes.com/BicycleEnginesGasoline.htm

Get your ride flat tires from:
http://www.airfreetires.com/Default.htm

-NIM