Updated: 15/11/2011 17:37 | By David Whitley, contributor, MSN Travel
World's greatest adrenaline highs

Twelve activities for buzz-addicts that are so on-the-edge they frequently tip over it

Jetpack flights (© Alamy)
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Jetpack flights

Where to try it:
Key West, Florida, with Jetpack Adventures

Here's your chance to live out all those futuristic James Bond fantasies. The jetpacks involved may not be burning rocket fuel - that would probably be rather dangerous - but the contraptions spurt out water at such a rate that they propel the harnessed-in user upwards. You're attached to a boat (from where the water is pumped in) and can steer yourself around with a fairly simple control system. The future of transportation has arrived, and it's all very silly.

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