Mountain biking at the new-ish
Picture Rock trail in Lyons. Weather was perfect -- low 70s, mostly sunny, with occasional short bursts of light rain.
The entire trail was narrow singletrack. On the way up, the first half was nice, but the second half was VERY rocky and a bit above my technical ability level, especially after not biking much at all lately. I had to get off and walk a fair bit, both on the way up and on the way down. I was even more tentative than usual because I was a little paranoid about injuring myself now that I've already paid for NAOC airfare, entry, and lodging...(and also because I was there alone).
Maybe I could ride most of it after four or five visits.