Went on the Flambannen on my honeymoon and it was good.
They stopped partway near a waterfall between two tunnels and you all pile out onto a small platform to take pictures etc.
Then this "mystical" music starts and a woman in a long flowing dress (with wetsuit underneath I imagine and hopefully some kind of safety line) starts dancing half way up the waterfall.
Me and Mrs Tim got the giggles. All I could think of was the bit about "farcical aquatic ceremonies" from Monty Python and the holy grail
http://www.youtube.com/watch?v=dOOTKA0aGI0