So, today I did an event that basically amounted to a scavenger hunt throughout a large indoor complex. It was amazing - we got to visit crawlspaces, roofs, construction areas, disused portions of buildings, and a lot of other amazing stuff. Very cool!
I'm a total coward, though, I was constantly afraid of getting caught/in trouble. I know the heads of both the physical and IT security there, so getting caught would have been especially interesting.
It was really cool, though, and I hope to do it again. Being places and seeing things that you aren't intended to see... priceless!