This turned out to be a fairly dangerous run. Unlike other 5ks I've participated in, the walkers and runners weren't kept separate. I saw a small child get trampled by a runner. I saw another runner almost get hit by a car because he was running outside of the course to get around the large groups of walkers. I personally had to weave in and out of groups of walkers who refused to yield the right of way, and most of the time ran off track in the mud because the walkers wouldn't share the sidewalk. Someone should have been monitoring the track.
The run itself is a fun idea, (although the paint doesn't wash off like the web site says it will) and I wasn't bothered by the rain. Had a good time with my friends, and scored a fairly decent time despite the walkers, the deep puddles, and the mud.