Hey Andrew. You are a lucky man to be able to fly standby world-wide. My travels are basically family vacations with my wife and 7 year old child and "maybe" we go diving one or two times in a week. I can hardly call them dive trips. But you will find a ton of people on this site looking for buddies for dive-specific trips to many of the locations you mentioned. During the mean time I highly suggest you take advantage of our wonderful local waters. If fact, if you have your own equipment already I know of a big group heading out tomorrow to Palos Verdes. And next Sunday we have a group of 30+ members from this site heading to Catalina.