Divers spend thousands and thousands of dollars to travel all over the world in hopes of encounters with big sea creatures. If you spend enough money, travel far enough at the right time of year, and the weather, tides, boats, and equipment cooperate, your chances of seeing something big are quite good. You can go to the reefs off Ningaloo, in Western Australia, where a spotter plane will direct you all day long to whale sharks. Or you could visit the South Atlantic Ocean off Cape Town, South Africa, and practically kiss a great white shark on the nose. Better yet, spend a couple of weeks on a liveaboard dive boat off Isla del Coco, southwest of Costa Rica, and rub fins with just about everything that swims in the sea. But no matter how much you spend or how great a place you go, just cruising on your boat is likely to be better. Here's why: To see cool things, you have to spend a lot of time on the water. And what is it that cruisers do? Exactly.