Long Island Aquarium has a shark exibit that is amazing. The number of sharks is astounding. 
These cretures are scary and beautiful at the same time. Their teeth are sharp and jagged. I would hate to encounter one of these fellows while swimming. The shark would definately have the advantage. I might consider viewing them from a cage
but never swim with them. I know many people believe thaat sharks are not dongerous but ask those that have survived a shark attack. I think you will hear a different story. Luke Weil would have a story to tell as well. He has seen more sharks in the wild than most divers.