Locals claim that the San Juans  offer the finest cold-water diving on earth, noting that Jacques Cousteau called them his second-favorite place to dive. When clear, one can glimpse a thriving ecosystem teeming with fish, amenomes, coral, starfish, octopi, and more.
Let Naknek Charters (Spring St. Landing in Friday Harbor, 360/378-2772 or 800/303-8386, www.naknekcharters.com ) show you around. This charter company offers dive trips off of its 45-foot boat, training, equipment, and scuba tank filling.