It seems like for every minute of footage I shoot I seem to spend an hour-and-a-half or so on obsessing about each minute of the final presentation. I have learned a lot about filming swimming from this video; you either want to be filming the race from under water or from about six-feet above the water while at a 3/4 viewpoint.
Additionally, use as many cameras as possible and film everything. It turns out that the even the most boring things can be the most interesting things to watch. Like a swimmer putting on their goggles or viewing a pleasant conversation you can't hear.
Obviously a tripod is vital but; like a snail-brain, I didn't use the one had despite having brought it! Nonetheless, this video is really going to be a lot of fun to watch and I am having a lot of fun making it.