See my member name for my favorite.......mainly encounter them in Puget sound, usually in mid to late summer. Most memorable was a night dive - 1:30am, 110FSW, and we had several show up & hang around for several minutes. Largest was around 13 feet.
Sharks are one of my favorite creatures. Small leopards are quite common off the coast here, and have seen pacific sleeper sharks a couple of times. Only seen one GW, probably 9 ft or so, and it fortunately didn't appear to be interested in us - never got closer than 20 feet or so.
Others I've been privileged to see are Caribbean reef & tiger sharks in the Bahamas; nurse sharks in Coz; scalloped hammerhead, tiger, and blacktip and whitetip reef sharks in Hawaii.
We're headed to Maui for the first time later this summer - anxious to see what we will find there.....