With friends while backpacking...
It was pretty cold (-7°C with winds, making the windchill drop to -15°C or so), but fantastic!
Tried to go again in feb 2012 but the weather was too bad, couldn't get there.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)