Beautiful day for a 4-mile fun run this year! There were "teams" of runners also, which were called "Centipedes." The race has thousands of people running it every year, and it is a great way to get a PR. While there are some hills, it is a relatively easy course.
The one downfall I would say, is that there is no free beer after the race! Normally I wouldn't care, but as it is a St Patrick's Day race, I was quite surprised. The course does have people handing out free shots and even has a mixed drink station in the last mile of the race. There is also a group of scottish bagpipe players that plays before the race.
Overall, I would recommend this race and will be doing it next year!