There are a number of different whales in the ocean, many of which list as some of the biggest animals on the planet. The blue whale is the biggest whale, and animal, currently on the planet, but because they are so large, the oceans have trouble supporting a large population of them. With the added impact of humans on that population, finding and observing blue whales is a very difficult thing to accomplish. Most whale watching tours aim to track and interact with hump-back whales, sperm whales, and right whales. All of these are more common than blue whales, and an ocean tour to watch them is life changing. There are even examples of mother whales bringing their young up to boats, in effect, getting them accustomed to humans, and boats. By searching on youtube, you can view people interacting with whale calves, just to give you an idea of what may happen on a whale watching holiday.