Doug51:Thanks everyone! It will probably be in May, August or more likely September.
Doug,
Let me be so bold as to suggest you see if May or September work...fewer vacationers around then.
When it comes to which island, you will find a good opinion for all of them...richly deserved good opinions! Each island is special and each can be a joy. For us, we like the Kona Coast of the Big Island best. Lots and lots of reasons...
Perhaps the most important is that we love about the diving there and it is not so much of a non-diving tourist mecca as Oahu and Maui. That translates to fewer people, something we like. But, do not get me wrong...there is nothing wrong with Oahu or Maui...and some folks would argue, with excellent reasoning, that Maui has the best diving on the islands. It is just that we prefer the Big Island.
I did not forget Kauai...just left it for here. I have written this on other threads...if you want to see turtles, Kauai is number 1! I cannot remember a dive off Kauai when we did not see turtles!
So, be sure to get Hawaii and be sure to let us know all about your trip!
joewr