Heidi and I swim every morning for exercise. We use a mask and snorkel... originally we brought them just so we could breathe easier, but we immediately learned that there is a lot to see, even in the protected area of Waikiki beach (see Google maps, satellite view - there's an area that's walled off to keep the water calm).
Well, today Heidi wasn't feeling too well, so I went by myself. I met a couple nice old guys who told me to bring them a fish. I swam for a while and saw an eel! Then, a little while later, I saw a little crab. I caught it and took it to the two men... they got a good laugh out of that. It was fun... but I work out more when Heidi's pushing me!