anyone done this waterbiking thing?

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I found this website,

http://www.cyclesafari.co.nz/

the other day and it looks kinda cool. In fact I think it could just the thing for a day or three's rest off the bike! I'm off to the world MTB champs in August and this apparently is in the same neck of the woods. Anybody out there/in here tried something like this? Should I tack a few more days to my itinerary to go and bike some water. It looks crazy but cool.

Erik