As it happens, I actually didn't do much riding outside. That was just the fun part. (As it turns out, though, the side of roads aren't level. At all. Now, I'm pretty inept at riding on the rollers in my mostly-level basement. But when there's a slope for water run-off built into the road, it actually gets a bit sketchy.)
Most of my riding was done indoors with my children running to fill up water-bottles for me and Star Wars on the TV. I might have preferred something else, but my choices are limited with small children watching on.
Luckily, my wife was ready with camera in hand to chronicle the part where I wasn't enjoying myself.
Mile 63. Almost 2/3 done. I actually felt pretty good at this point.
As many other participants have observed, this was hard. I actually cheated, in my mind, because I rode 100 "miles" in 3:36:20, which is much, MUCH faster than I could ever do on the road. My sympathy for those who rode it in 6-8 hours. I think I would have died.