Big Island I - Mauna Kea Trip
An impromptu jaunt up a staggeringly large volcano, breaking my previous land-based altitude record by over 1.2km. Altitude sickness at 4.2km elevation is quite interesting - as were the instantaneous headaches we all suffered on returning to the comparatively oxygen-rich 3km level.

(Having seen the majestic SCIENCE inside the Keck observatory, there was the option of waiting for sunset at the top of the mountain - but we craved oxygen too much, and retired to a more sensible altitude. And got to see the sunset at the top of a deeply primeval, tree-covered cinder-cone surrounded by drifting clouds and lava fields. Not a bad exchange.)

Coming soon: lava tubes, petroglyphs, volcanoes, a collapsed wind farm and assorted other oddments!
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