After a few WPs, the route went into a nature preserve. The rules posted at the entrance specified that it wasn't allowed to go in there with bicycles, and that entry was forbidden between sunset and sunrise. We were still good on that, but we could see the pair who had overtaken us riding their bikes across the muddy paths ahead of us!
Unfortunately, we didn't manage to get out of there before sunset -- mostly because of the muddy paths. It was beautiful to see the light of the setting sun over the water and the reeds, though. We were out by, I think, 20:45 -- it hadn't gotten completely dark yet, so we didn't feel too bad about it, even though technically we had no business being there.
Now I read in one of the logs that someone found the cache at 00:15, "using the light on the GPS". There is no way that they were in the nature preserve before sunset!
I can understand that you're all fired up to find a lot of caches because of the event, but I was quite saddened when I found out about this blatant disregard for the rules that the owner of the nature preserve had set down.