Originally Posted by
caloso
Haleakala. It's not that steep, but man it's a long grind. That, and I was really affected by the altitude the first time I did it.
I came here to say this, though honestly the altitude was mostly fine for me. I may cheat, since our local hill here is actually higher at the top -- but you get to start at 7,000' or so.
I did it without 'really' training and at the end of a year with a lot of flying and sitting down at sea level. It properly hurt.