Those trails at high altitude where a pain, but after my next trip there when I bring my bike they are probably going to seem easy. I am dreading the thought at trying a 19 mile climb that tops out at over 12,000' but if I can pull it off it will probably be one of the most memorable things in my lifeI was just there on Saturday. Hiking at 12,000' is exhausting! The weather conditions were pretty good. It got down to 49 and rained a little, but otherwise it was awesome!