After living in the Key West for three years in 1998 thru 2001 I saw several sharks on many dives. If you are diving out of Key West try to get to some of the outer reefs. You should encounter some Nurse Sharks, and maybe some Reef Sharks. Me and my new wife will be in Key West at the begining of Sept for our Honeymoon. We are planning several dives all over the keys. You should really try to get out to Looe Key for a great reef dive.