Tip two: If it's something you don't see very often, keep on clicking. With dolphins swimming through fast waters and you standing on a motor boat taking flight every 15 seconds, you're likely to get a blurry picture. Solution, get yourself a 4Gb memory card and keep clicking. Hopefully in the end you will have a few good pictures to keep, and prove to your wife once again that spending a fortune on your camera was worth it.
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Nikon D80, 1/800sec, ISO-160, f/5,6
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Nikon D80, 1/500sec, ISO-160, f/5.6