Definitely gathered up some suggestions from this thread and have been checking things off the list, so thanks everyone.
Heading to the Big Island on Monday for a day trip mainly for the volcano related stuff. Wife and I are the science types, so this is cool stuff!
Drove around Oahu a bit in my (not a Model S

) rental . Traffic hasn't been as bad as people made it out to be. Not used to the super low speed limits, though. Got some pretty good photos.
Snorkeled Hanauma Bay yesterday.... got burnt to a crisp even with sunblock. lol. So, today has been a mostly indoor recovery day. Shopping for gifts and whatnot. Did get some pretty awesome GoPro pics though.
Overall... being a tourist like I'm supposed to be.
Edit: On a side note...... I feel for Hawaiian day traders... opening bell at 3:30AM... sheesh.
Edit 2: Another side note.... I generally don't post publicly about my whereabouts until after the fact. We got here on Wednesday, actually. Starting today, however, I have some family staying at my place until a week or so after I return. So, can safely mention without worrying about some unscrupulous reading coming to the conclusion that my home is fresh pickings.... not that many who could deduce that location would be taking on such a task... but, I'm paranoid in that regard.