Ya so this is an old thread, but now I've moved next to massive recent lava flow here Bend Oregon and hiking alone on the lava is an extremely dangerous thing to do, but thats what I'm going to do, but I've decided to carry a cell phone Its so rough that a fall 100 feet in could be very bad, a difficult rexcue, if I survived rocks moving. I'll certainly be dressed for it, might even wear a helmet.
Jim