Your camera has no dragon boat mode? Get a new one. How about using ... Sports Mode? That should do the trick.
After the race please take the time to read through the basics of photography here to learn. Hopefully then you will understand that there are no Dragon Boat settings in the same way as there are no wedding settings, children birthday party settings or funeral settings. What is required is your understanding of how a camera works and what you need to setup to get the pictures you want. I that's too much for you then stick to camera phones or Point and Shoot cams.
Hi there. Looks like you have not much experience with controls & shooting of SLR but nevertheless there is always a first time for everyone.
Here is what you need to do.
1) Get a long lens, preferably 300mm with fast focus, for the in water / action shots. A short lens for anything you may like.
2) A big & fast SD or CF card. You will be hitting the camera memory buffer very quickly if you shoot a lot. Once you hit the buffer the camera continuous FPS will slow down, you will miss the peak action shots.
3) Shoot in manual mode where you are always in total control of the aperture & shutter speed. Do it often enough, you will be very proficient & you will become 1 with your camera.
3a) When shooting in manual mode, check the camera viewfinder information display for exposure, shutter speed, aperture & ISO before you release the shutter.
4) Settings for your camera:
5) Release, Continuous high
6) Metering, Matrix
7) Shutter speed ( 1/500 or more to freeze fast action, 1/100 or less if you want to be creative to add blur for portraying motion in your subjects, like the rowers oars!)
8) Focus, AFC, 9 point dynamic area.
9) ISO, AUTO. Lowest ISO 100, Highest 6400.
10) Aperture, f/2.8 to f/4 is good enough. Aperture controls your depth of field. Open up if you if want to isolate the subject. Close down if you want more depth.
11) Get / borrow / rent a monopod to support your cam / lens.
12) Learn to anticipate the subjects, release the shutter when the action begins.
13) Practice before the event.