There was a French couple in the 80's or 90's I believe, the Krafts (spelling may be off) Maurice and Katia Kraft, they travelled the world, helped out in areas affected by Volcanic eruptions, did studies of their own, and generally photographed and documented Volcanoes, they were nuts about them.
They died on the slopes of Mt Unzen iirc in Japan when on top of a ridge overlooking a valley where countless dozens of pyroclastic flows had gone down, when suddenly one flow simply kept on going, instead of diverting into the valley, it went up and over the ridge, killing them and several scientists/reporters? instantly.
But the point is Maurice Kraft had in his past always wanted to have been able to canoe down a lava flow, one with a very low SiO2 content (more Silica more viscous = more sticky so to speak)
