The only bobsled I've been on is the DISpatch mASTER TRANSPORT, formerly the Avalanch Run, and it was a pretty fun ride. I looked at some pics of it before its enclosure, and I think it would scarier to go on it in the open, and see yourself just "bobsleding" along, seeing your car look like is almost going off the track. Can't say that from experience though :(.
~Joe
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Ride 'Till you drop