Went to the Sabaru and Keck telescopes whilst on b...

Went to the Sabaru and Keck telescopes whilst on business at Hawaii. The views from there and the acclimatisation camp were something else - beautiful.
Due to being up 14 000ft, you MUST take care. Oxygen has a relative low level (~40%) although the level of oxygen is actually very close to 100% but at this height the partial pressure is very low. You must drink water as your body reacts differently at this height, listen to everything the people at the telescope tell you and most importantly tell someone immediately if you feel weird, headachy or sick - if not you are most probably going to pass out (one of our party did!).
The people at Keck are nicer and easier to communicate with, although the people at Subaru are very nice also!
Enjoy the wonderful telescopes, drink and keep warm!